bucking/shuddering

[olred90]

my trucks been bucking/shuddering. the problems real intermintent. sometimes it runs goods, others times not. sometimes when i pull out it'll buck real bad. and when im dring it'll shudder. i replaced the plugs,wires, cap, rotor, fuel filter, fuel pump, and ground wire. my check engine light will come on for a second and go off sometimes too. what could the problem be

 

[Nhaz]

If the light blinked, then the truck threw a code and the computer will save it for awhile. pull the codes and that may give you a idea where to start.

 

[adsm08]

+1. Get that code and chase it down. Those old EEC IV systems only turn the light on when the problem is present, but it does hang on to it for a few weeks.

 

[feellnfroggy]

Maf or o2 is prolly going bad. I would run some MAF cleaner through the intake. As well as a can of seafoam through the Brake booster vacuum line.