I have an 88 Gmc with a 305 throttle body in it. When I first start it up in the mornin...or after it has cooled off a bit it runs erratically..the idle lopes....and it sputters. It starts great and once it's warmed up it runs excellent. I have changed the temp sensor already...no help. ANY IDEAS???
1988 GMC 1500 - Erratic Idle
Jul 09, 2003
1 Replies
Had the same problem with my 1990, changed the O2 sensor helped a little, and then the EGR valve. Try that good luck, check the TBI that it tighten down, no leaks
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