Hey y'all. This is my first post but I've used this sight a lot the past few months after I bought my 93 V6 auto 4runner. I've always done the search thing and have found it useful in solving problems but this one is tough.

Issue: When in 4th gear(auto) it stumbles and hesitates exactly at 1750-2000 RPMS when warmed up. It also stumbles a bit at idle. I've done the following already.

wires
cap/rotor
plugs
replaced TPS checked and adjusted to specs
Timed
adjusted idle
Did custom Fipk style intake(old hose was cracked)

I was wondering if anyone has had a similar problem, I'm hoping the 4th gear hesitation at 1750 rpms will give it away? One note to mention is that there dosen't seem to be a difference in idle/rpm when i used the jumper connection before and after the TPS adjustment/replacement.

I don't have any history on the vehicle except for the head gasket recalled in 99 and was going to check/replace the timing belt soon, but an old timing belt wouldn't cause this would it?

Any help will be appreciated, Thanks

 

mine stumbles at that same rpm, and its throwing the p0300 and p0302 (random and cyl #2 misfire). havnt really replaced anything yet, but i did swap the coils to see if it follows that cyl. ive got a 99 3rz auto though...

 

I did have a code 14(ignitor) sevral weeks ago but i cleared it and it hasn't come back. I don't know the history so I figured it was an old stored code?

 

anyone??

 

I'm wondering if its the EGR valve? When I pull the vaccum line there is no change in idle, runs fine(cold and warm). Isn't it suppose to sputter and die when I do this?

 

I unplugged the EGR vacuum line and it runs wayyyyy better, it still hesitates a bit at 1800 RPM but it's about 75% better. I'll have to do a full EGR eliminate and see if it helps 100% Can't wait!! Chalk me up as a Non-EGR'er!! lol