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b230ft backfire & poor power curve 700 1989

I've Missed something. Replaced the intake manifold gasket & reinstalled manifold+ re-installed previously removed distributor; static timed to spec and started engine.
So, engine runs ok but backfires on deceleration and tops out @ about 65mph on the freeway (struggling).
Went thru the faq and not sure where to go from here as I found no intake leaks and timing is correct.
What'm I missing please
thanks


--
steve m






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