I have a 1993 Cougar XR7, 3.8L,Auto, completely stock, car had blown engine when i got it, I swaped in another 3.8L and it has ran fine for the last 6 months, now it falls on its face within 2-3 seconds of acceleration after stop, I have changed fuel filter, fuel pressure is 29-30 at idle, 39-40 with regulator vac disconnected, under acceleration fuel pressure never drops below 25 lbs, a friend thinks my cats are clogged, I have been diagnosing these codes useing mitchell on demand5, i know the oil and fuel are not contaminated, the only codes that i can pull are 172 and 136, it passes 111, car runs at 17-19 degrees spark adv. and retards to 11-13 degrees when it falls on face, HELP, Im allmost outta the cougar bussiness
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