matt try unhooking and plug the vac line to fpr put a hose on the fpr into a can then pull the vac line off of of the map sensor and plug it and run a hose from the map sensor into the cab put a hand vacuum pump on that hose and pull about 18 in of vacuum on that hose you should be able to fool the ecm into thinking the eng has no load on it that should widen the pulse width to the injectors and lean the mixture enough to drive home should work btw when before you replace the fpr blow throug the return line make sure there is no restricton i had a cust car that we i could not make pass smog check dead rich high co rich mixture high hc makes rich missfire turned out someone had put a jack in the wrong place and smashed the return line flat, this will probley work, good luck ted