Idle problem 1990 with gt40 crate engine

Stulza7x

Member
May 13, 2016
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Started as a surging idle when the engine warmed up then after a year the idle rose to 2500-3000 rpm I replaced the IAC and now the idle is poor and the car stalls and check engine light is coming on. Thinking about tps next unless anyone can think of something else. I have never had any other issues with the car in the past 3 years
 
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Mustang5L5

This is a big reason why I pulled it out
Mod Dude
Feb 18, 2001
31,563
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Massachusetts
If the check engine light is coming on, run the engine codes. Start there before changing parts