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Re: weird don't have a clue
Are you getting any trouble codes? Whats your Check Engine Light doing when you turn just the ignition on and then crank the motor over? . Your timing could be off aswell. What was it set at BTDC? Bum timing could explain sluggishness and if your having any backfires. I had a shot ecm in my 85 2.8 mpfi and it ran in "limp mode" which was extremely sluggish, no power but would idle somewhat smoothley. Check engine light was on, stayed on while running but would not flash any codes when grounded... Given that it ran with one ecm n not the other i'd point my finger at that. Also agreeing that these ecm's go hay wire and create weird problems!
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