88Turbodreamz

I am looking at a 88 gtu to buy its dirt cheap and a clean shell but i need it to be running as i wont have another car. The owner says it idles fine, but backfires a little more than normal and has trouble revving and will sputter and die eventually.

Has anyone had this problem before? TPS, Maf, FPR? Ecu?

IF anyone has some info it would be very helpful

Thanks in advance!