Help!!!

[Ruger9]

I`m hopeing someone might be able to help me out with an issue I`ve recently started having with my 96 4runner. When I come to a stop at a light the rpms will drop as expected to adile. But after a min the rpms will jump and it seems like the engine revs a little, and wants to surge foreward. I`ve had it to 2 mechanics including a dealership. But since it doesn`t happen all the time, and of course not while a mechanic is in it they were no help. But I know somethings not right. Any ideas would be appreciated!

 

[02SE]

Do you have your A/C turned on? If so, the idle will kick up several hundred RPM when the A/C compressor clutch engages. It takes power to turn the compressor, so the ECU compensates by bumping-up the idle speed.

 

[Ruger9]

That`s the thing, it used to do it just when the ac was on. But lately it`s been doing it with out. Seems to be happening longer the last couple times also. Used to be just a quick surge foreward. but now it like revs through the duration of the light. If I take my foot off the break it would go. It started right around the time it got hot here in phx and I started using the ac. but like I said it`s when the ac is off. So I`m wondering if it has something to do with the engine working so hard the times the ac is on.

 

[02SE]

Another possibility is if you have your climate control set to defrost, the A/C compressor will kick on to dry the air. Which will bump-up the idle speed too.

 

[Jc12]

mine would do this exact issue along with slight slipping at highway speeds once in a while.. it was the TPS, i would consider replacing that - do you have any codes? you could also try the usual and clean the throttle body etc and do a tune up

 

[LittleCaesar]

+1 on the codes.

Clean your TB/IAC/MAF as well.

 

[Ruger9]

Thanks for the input guys! I`m gonna try all the above. I was worried it was a tranny, or something more serious.