Best place to start, make sure your spark plug wires are not rubbing against the headers/arcing out - then move on to cap/rotor/plugs (make sure none are fouled out or worn) make sure the connections for each wire are good also
It couldn't hurt to hook a fuel pressure gauge up, either
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2003 Regal GS - the beater/daily driver - somewhat stock (yeah right). No its not a mustang, at least it's blown.
2001 GT Black on Black 5 speed
MM Strut Tower Brace/Weld-In Subframe Connectors/Koni Springs&Adjustables/Cobra Brakes/Cobra Rack/Tri-Ax/3.73s/SCT Tuner 56k miles