Please help with 89 park ave 3800 V6 running rough

[garysinnj]

Hi ,

I hope someone can help me . I have 1989 buick park ave 3800 motor . The car runs great until certain situations . If I sit too long in traffic or the motor gets hot the car starts to misfire and buck and stall. Then if I get moving and can get to a high speed it almost clears out still sputters a bit but then if I park and let it sit it will run fine unless I get into traffic or more heat . I have tuned it up , new crankshaft and camshaft sensor , New coil pack , new igniter . I have been told by people it may be a (fuel injector , poss. mass air flow sensor , computer, clogged cat ) ? I cant keep dumpin money in guessing what the prob is . Has anyone seen this before PLEASE HELP

Ty
Gary

[HotZ28]

Do you have any codes? Are both fans running when hot? Have you checked your fuel pressure and fuel filter? How about the CTS and coolant level?