Too much air not enough fuel. Damaged carb intake boot, manifold/plenum gasket.
Engine timing too advanced.
One of the sensors may be disconnected or out of spec.
TW, Ta sensor or gear shift sensor they send a signal to the ECM.
Did the exhaust gaskets get replaced?
yes new exhaust gaskets and timing belts--this will give me some place to start--thought it was lean,havent read plugs yet. there is supposed to be air/fuel adjustments on carbs with special tool(shop here does not have one) also these are the same carbs that came off other engine,altho i did replace the main jets. thanks trike lady