I just replaced the engine in my truck not too long ago and it did the same thing...
If yours is still idling rough you might want to check it over for vacuum leaks, mine had a leak at the base of the egr valve that when I resealed it the rough idle quit.
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86 GMC l-bed 4x4w/ 350 4-bolt main, 700-r4, Edlebrock performer intake, Edlebrock 700cfm
boublepumper, Edlebrock polished aluminum valve covers and air cleaner, MSD ignition & coil w/ splitfire dual-core wires with Hei distributer that has a new curve-clamp kit installed...
373 rear-end infront and back(by Richmond)
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86 GMC l-bed 4x4w/ 350 4-bolt main, 700-r4, Edlebrock performer intake, Edlebrock 700cfm
boublepumper, Edlebrock polished aluminum valve covers and air cleaner, MSD ignition & coil w/ splitfire dual-core wires with Hei distributer that has a new curve-clamp kit installed...
373 rear-end infront and back(by Richmond)
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