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il give you a run down of what i would do.
check fuel pressure never assume anything.
verify a consistant reading on the maf signal wire while idling.
check your compression, do a leak down test if possible
verify your getting constant 12v or more off the battery while idling. could have a bad alternator.
theres alot of stuff you can check but if you dont start with the basics you can waste alot of time
bad ignitor and or distributors are also possible.
also possible you have a bad ground somewhere.
good luck
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