94 chevy truck 350, 2 wheel drive?

Question

seems to be miss fireing , took it to the shop had a tuneup wires,cap,plugs, rotor , plus a new coil , new map sensor, new module in the distrubitor, it idoles fine, when i put it in gear and give it just alittle gas it does it, if i run the ac it does it, what else can i do to get it running great?

Answer 1

ernest, you took it to the shop, and now you think you'll get the answer by asking a question.  Take it back to the shop and demand your money back or have them make it run right.  You put a ton of money in this truck and its not right.  Who is going to fix it if the shop doesn't do their job and if you don't make them do it.

Answer 2

missing under load can easily be a mechanical problem in your engine.try running a compression test..a bad valve can idle smoothly but miss under load..a cylinder leak down test will give better result,s.

Answer 3

You didn't mention fuel filter, did you replace it?  If you did then check the fuel pressure to see if you have a weak pump or bad regulator.  I assume you had the computer scanned, did it give any codes?

Answer 4

First you can't check the codes if the check engine isn't on. Your timing belt could have skipped. Or you may have to give it a tune up.