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Old 03-18-2020, 10:55 AM #1
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Sputtering when taking foot off gas on highway? Stumped

I got a 99 limited 170k approx. the thing runs and drives good but has a lot of issues im trying to hunt down. The latest being when i am on the highway and i take my foot off the gas shes decels nicley say from 2-1k rpms then jumps back up to to 2k where it holds and decels from there very slowy. Does it every time and when i put my foot back on the gas even a little it downshifts immediately Never holds gear. I take care of the truck always do routine maintenance Have cleaned maf tb and iac thoroughly Did 2 seafoam treatments and a redline fuel system cleaner in the past month Also recently put a flowmaster big block on. Could this be the issue? Cat clogged? Iac? Any ideas? Thank you in advance!
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Old 03-18-2020, 11:25 AM #2
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I'm thinking shift solenoid or fuel pump. Pretty sure there's a YouTube video on checking your shift solenoids
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Old 03-18-2020, 12:31 PM #3
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When you de cel if its safe place it into neutral to try to isolate it some from the transmission. If it is a Transmission issue ensure the fluid levels are proper. Keep hunting.
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Old 03-18-2020, 03:33 PM #4
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This actually sounds normal to me...

If you are going from cruising in 4th/OD with the torque converter locked to coasting, a few things happen - first, the torque converter unlocks (the drop in RPMs to ~1k), then the engine/transmission/torque conveter sync up in 4th/OD and the engine speeds back up a bit to the correct 'coasting' RPM. When you re-apply throttle, you go from coasting on the torque converter to power on the torque converter and the RPMs go up (that's what torque converters do!!), then if you are going back to low throttle opening (cruising), the torque converter will re-lock and drop the RPMs a few hundred again back to where you were before lifting and re-applying throttle.

More modern engine/transmission combos often keep the torque converter locked while coasting and you wouldn't see this RPM 'dance' that the 4Runner does...

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Old 04-29-2020, 11:02 AM #5
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Thank you for the replies! So i just bought a 98 2.7 4x4 just as a side beater (256k burns a lot) It does not do this strange rpm dance it behaves like a normal vehicle and it has the same trans. The rpms only ever go up when i control it with my foot. In fact in general the trans on that one is better shifts way smoother. My v6 ever since i got it bangs or pops hard when it shifts and now it feels like it wants to drive itself sometimes. This all started for me after i put the muffler on and after i played with all my cables. I think i messed up the cruise control cause it bucks and jerks downhills in a consistent pattern it used to just engine brake now it seems confused. I also get a vibration with intermittent thumping under my ass at idle and feel the same vibration at high speeds if anyone cares lol i have done all of the common maintenance suggested on this forum. Please help i dont want to sell the v6 its so sexy in every way!
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Old 04-29-2020, 01:16 PM #6
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not sure what the exact measurements are but the should be just the slight amount of slack in both those cables. The way I look at all three of the cables should have tension on them and just a slight amount of slack.
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Old 04-29-2020, 02:56 PM #7
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Quote:
Originally Posted by keeperofgoal View Post
My v6 ever since i got it bangs or pops hard when it shifts and now it feels like it wants to drive itself sometimes. This all started for me after i put the muffler on and after i played with all my cables
You have the transmission line pressure cable (also refered to as the throttle kickdown cable) too tight. Get the vehicle up to operating temperature and then loosen that cable until the shifts are smooth enough for youunder normal driving.
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