1995 k1500 missing when accelerating

I have a 95 k1500 with 111,000 miles. Ran great until I had the intake manifold gasket repaired for leaking yesterday. The truck idles fine and runs fine when accelerating from a stop until you step into the gas pedal, then it starts missing and bucking, if you let it get up to 50 mph by accelerating lightly as soon as it downshifts to 4th and is running at about 1500 rpm the bucking is severe, if you bring the rpm up by shifting unto 3rd it is reduced. Any heavy acceleration causes the missing and bucking. Until the manifold gasket was replaced it ran great. I have to go back to the shop, which is usually very competent Monday to have them figure it out- any ideas? I thought Timing retard/advance but don't know- there is no knocking....

I have a 95 k1500 with 111,000 miles. Ran great until I had the intake manifold gasket repaired for leaking yesterday. The truck idles fine and runs fine when accelerating from a stop until you step into the gas pedal, then it starts missing and bucking, if you let it get up to 50 mph by accelerating lightly as soon as it downshifts to 4th and is running at about 1500 rpm the bucking is severe, if you bring the rpm up by shifting unto 3rd it is reduced. Any heavy acceleration causes the missing and bucking. Until the manifold gasket was replaced it ran great. I have to go back to the shop, which is usually very competent Monday to have them figure it out- any ideas? I thought Timing retard/advance but don't know- there is no knocking....

First.
Let the shop that did it check it out.

I have a 95 k1500 with 111,000 miles. Ran great until I had the intake manifold gasket repaired for leaking yesterday.
...


Man, I think you answered your own question there. Sounds like they messed something up.


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