Thread: Idle / RPM issue ** Videos ** - Need Help

I'm having an issue with my RPM's. Here's a rundown of what I did and is happening.

I just recently changed from an LS1 TB to a Accufab Ported TB. The reason for this is the LS1 was messing up my IAC's. At least that is what I thought.

After I installed the ported TB, my IAC's were still messed up. I found out that the wiring for the IAC was bad so I replaced the connector and wires. Being that a wire was bad, that actually might have been the problem instead of the LS1 TB.

Anyway with the Accufab TB installed now and IAC working good. My RPM's hang high then drop after I hit the throttle. Weither if I'm in park or driving. At idle I'm at 900-1000. After I hit the throttle the RPM's go up then instead of going back down to 900 it would hang around 1300 then drop down. This is especially annoying while driving.

My IAC is at 47 at idle. My TPS is .5 v at idle and 4.2v at WOT.

I don't have any vac leaks because I had a smoke test done. This is driving me crazy. I'm very tempted to put back the LS1 since the IAC wiring was bad to begin with. I want to get this RPM issue figured out first. I can't/don't see why this is happening.

Here are a couple of vids. Sorry if they are on the big side. They are in HD and didn't have time to resize.

Any help and/or input would be great.

http://www.nymcgp.com/members/silver...leProblem1.mp4

http://www.nymcgp.com/members/silver...leProblem2.mp4

The iac and tps values look good, do you think it could be how you have the vacuum lines routed?

Are you using a vac block?

Originally Posted by RideWithPride

might be a warn flexplate having trouble catching the teeth but honestly thats random ass guess

Catching teeth on what?

What cam do you have sal?

I didn't change the routing of my vac lines. I do not have a vac block.

All I did was swap out the TB's

I have a stg turbo cam and I just put a meziere flexplate on.

I'd put the LS1 tb back on..

I'm really stumped on this one.

I'm stumped too.

I'm not following what you're saying. The flywheel is attached to the tc and the motor.

Update

Just put back the LS1 TB and still have the same issue. This is driving me nuts.