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Old 05-19-2022, 08:36 PM #16
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Originally Posted by clanofwolves View Post
I replaced the Idle Control Valve and she drove it and noticed it not stalling, but still hunting a bit at lights while the break is on in drive/stopped/idle. So it is better, but is there anything else I should look into?

Thanks so much guys!!
Glad you got it sorted. The other component that might be out of spec is the maf, some do go bad. Also vacuum leaks.
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Old 05-20-2022, 07:58 AM #17
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Originally Posted by Bad Luck View Post
I would give it a few days of driving to see if it goes away. Sometimes it takes a few trips for the ecm to relearn for a new part like that.
I thought, and hoped, the same thing so I told her to drive it a few times, then let me know how its running.
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Old 05-20-2022, 08:02 AM #18
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Glad you got it sorted. The other component that might be out of spec is the maf, some do go bad. Also vacuum leaks.
Yeah, I have had MAF issues with my oldest daughter on her Chevy (that car sucked as a reliable vehicle and somehow destroyed them, along with transmission issues (don't get me started)). This one always looks fairly clean and I hit it with a short blast of MAF sensor cleaner every few years... and she doesn't throw a code like the Chevy did. As far as vac leaks, maybe I'll spray a little starter fluid here and there and see if anything ups the throttle. There are a few vac lines that might be original, but the main ones (like brake booster) I changed out years ago, nothing looks cracked, but one never knows as air can move in tiny gaps 'eh?
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Old 05-22-2022, 10:05 AM #19
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Could be the coils

I had a similar issue and it turned out to be not the spark plugs but the spark plug coils. Best of luck.
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Old 05-23-2022, 08:30 AM #20
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I had a similar issue and it turned out to be not the spark plugs but the spark plug coils. Best of luck.
Wow, now that's another possibility. Did it throw engine light or codes? How did you diagnose it?
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Old 05-23-2022, 08:32 AM #21
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Found this... not sure why I wouldn't get a misfire code, but I can Ohm them regardless.

Coil Pack Testing for 2000 4R 3.4L?
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Old 05-23-2022, 10:58 AM #22
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Originally Posted by clanofwolves View Post
Found this... not sure why I wouldn't get a misfire code, but I can Ohm them regardless.

Coil Pack Testing for 2000 4R 3.4L?
When you check the coil packs make sure to test them cold and hot. I had a coil pack that only failed when hot and it never measured out of spec. Compare the resistance values of the coil packs to each other to help identify a bad coil pack.
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