7mgte weird idling issue

[Tysree]

So when I get to Normal running temperature is when the symptoms start occurring.
After I shift or just rev the engine and don't touch the throttle the idle bounces very low around 3-400 rpm, if it doesnt die, it will catch itself and continue to idle at areound 1,000 rpm and act like nothing ever happened.
I tried replacing the iascv didnt really do much.
checked for vacuum leaks and boost leaks.
Thinking maybe my coil pack or cps?
only mods are 3" down pipe and aftermarket intercooler and piping
1988 supra
Anyone have any ideas?
Thanks.

 

[Backlash2032]

You said you have aftermarket intercooler piping.. does this include an aftermarket blow off valve?

I ask because bovs that vent to atmosphere create a rich condition when they open, because they bleed metered air.

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[Tysree]

Yeah it's aftermarket the weird thing is that it was fine driving it the past few months then randomly started doing this.

Maybe bad BOV?

 

[sharpsupra]

wiggle the wires in the cps when the engine is running.

 

[shipkiller]

when I bough my supra there was a boostleak, a vacuum leak and the stock BOV was splitted in half.
Yeah my car did that what you described, A LOT.

 

[planemos]

wiggle the wires in the cps when the engine is running.

+1 check the cps wires they are often brittle. Driftmotion has a new wire/connector replacement.