74 manifold swap issues!!
so the other day i installed the 74 manifold with the stock 72 egr tube and tb.now when i start the car i revs high than goes down(does not rev high for more than a sec) if i put it in n it idles like i have a cam in it ( mind u when i had the stock mani in the a/f gauge read 14.9-15.2 at most!) anyways now it running at lik 16.9 to --- at idle. it threw the cel but i didnt read it i just assumed it was either the egr or vacuum so i checked every thing and unpluged the batt to reset the ecu and it still running like idling like shit! so can someone give some help please!!!!!!!! not sure if im making sense