3.1 has a studder past half throttle

[hellfire]

it an 91 3.1 the idle is ok most times once in a while it will be lumpy but when u go past half throttle it will spit and sputter and will not go it will shut the engine off if it does it too much... ive repalced plugs , wires,o2,air filter, throttle positsion senor, egr, throttle body has been cleaned, and fuel filter any ideas
thank u

[bszopi]

Sounds like a bad coil pack.

[geoffinbc]

Yea the first thng I would have checked would be Coil Packs and Ignition module