Q: I replaced a lot of things on my truck and it still spits and sputters. Why is it doing this?

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I replaced pushrods, rockerarms, cap, rotor, valve cover gasket, exhuast manifold gasket, ignition module, pick up coil, ignition coil, fuel pump and filter. It runs great in park but when i go to drive it spits and sputters. Why is it doing this?

My car has 140000 miles.
My car has an automatic transmission.

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