where to start? could be dirty fuel filter, carburetor, or injectors. plugged exhaust...feel how much exhaust pressure is coming out of the tailpipe. could be burnt valves... do a compression test and see if you have any cylinders weaker than the rest 130-180 PSI is best, but the key is to see if they're all within 10% of each other. has the car sat for a while? or acting up all of a sudden?
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