pookie Posted September 4, 2010 Share Posted September 4, 2010 I have a 88 comanche pioneer 4.0 liter.When i first start the truck the idle will speed up then goes back down to a real low idle and it keeps doing this over and over until i drive it to work a few miles then it seems to idle correctly.But it still seems to idle lower than normal.ANY suggestions on fixing the problem.THANKS Link to comment Share on other sites More sharing options...
ComancheKid45 Posted September 4, 2010 Share Posted September 4, 2010 Off the top of my head. IAC (Idle Air Control) TPS Check all exhaust manifold bolts for looseness :thumbsup: Link to comment Share on other sites More sharing options...
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