What kind of plugs??? have you checked over your wiring harness for the fuel injectors???? i had the same problem changed the harness still did looked closer and i just swaped a broken harness for a broken harness sometimes even small cracks in the insulator can through things off this would be my guess,or perhaps a stuck injector

"Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but STUPID lasts forever."-Aristophanes. --93 pgt,headers,intake,borla=14.9 1/4mile