First off, Hello everyone, am new to this forum. GM's rule. Now with my problem:My dad and Iput a 1988 350 cu.in. engine in his 1991 4.3 liter full size pick up. The engine is from an 88 police intercepter that had a carberator.we replaced the induction with a 350 throttle body fuel injection and 350 computer with all 350 sensors. (map sensor, idle sensor, etc.) The engine is stock except for a Comp Cams 08-300-8 cam (duration is 206 intake and 210 exhaust at .050 lift, 112 centerline, .450/.480 lift) and shorty headers with a catback exhaust. The engine runs good at high rpm but spudders at idle and skips at low speeds. Where did go wrong? Any help would be greatly appreciated!

 

well oddly enough had the same problem a few years back come to find out just had a bad plug wire for the no. 3 cyl