Why would a 98 ford escort sputter when accelerating?

[Shanna]

About 3 months I had a new engine put into my 98 ford escort. Since then it's been sputtering on and off while accelerating, before it would only sputter in the morning when I first started driving. But today it sputter on and off all day, especially when accelerating and occasionally at stop lights. I'm wondering if it just needs a tune up or if its the fuel pump. What do u think?

[william]

it is in the carb or intake air valve on fuel injected cars the warm up on it is suppose to adjust the air and fuel ratio or basically the chock on a car is out of adjustment or not working a vacuum hose could be broke and causing to not work since generally it is controlled by vacuum

[SVOMAN]

try checking for trouble codes, it could be plugs, wires or sensors..
check your tank, it could have some water in the bottom..

I find on mine it helps to run a tank of premium through it to clean things up..