jchcomputers

I have an Idle prob on my 89 GT
sometimes it idles at 750.. and sometimes it Idles at 2500
it varies. I have already replaced the IAC (i beleive thats the one located near the throttle body on the plenum) can this be a bad MAP sensor?

tom50

prob your tps

wheelliftnpony

ya could be ur tps.. also make sure ur tb is cleand.. could stick every once n a while.

jchcomputers

I changed the TPS... same problem... should I try MAP or MAF next?

tom50

I just went through all of that, It ended up being my tb was sticking even after cleaned. try a different one