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I have been trying to figure this out so now im turning too you guys for help i have a 03 mustang gt with two valve motor.... and a about 1500 rpms my car seems too studder but as soon as it hits 2000 rpm it stops... and also this is the really wierd part... if i put a full tank of gas in it 91.... it cuts out and stops running and just runs like crap... but 30 min on that tank of gas it runs fine after that... i have changed plugs put ngk iridums in.... also omed injectors and coil packs.. everything checks out okay...also put new fuel filter in.. can anyone help me.. the car doesn't have much for mods.. just a diablo programer and cool air intake..