Hello everyone. I am having some pretty severe problems with my 88 shelby z 2.2 turbo intercooled. The car starts up almost right away and idles a little over 1K rpms for about 5-10 seconds then drops down to 600 or so. At this time when the rpms drop the check engine light comes on. The code that comes up is 12 13 and 55. I know 12 and 55 dont mean anything and that 13 is the map sensor. I have replaced the map sensor twice now and still have both sensors. I also checked the vac lines and to my knowledge i cannot find a leak. Ok now for the really bad part. The car will drive in first gear but its like driving a tractor. It has absolutely no power whatsoever although i can hear the turbo spooling or atleast beginning to. The cat is not plugged. I cannot rev the car with the clutch in without it bogging and the rpms wont go over 3000 rpms. Now for the list of things i have replaced. I have replaced the TPS, MAP, BARO SOLENOID, NEW TURBO, NEW CLUTCH, NEW FUEL FILTER, NEW PLUGS AND WIRES. I have checked all grounds, removed them, cleaned them and replaced them. PLEASE SOMEONE HELP THIS IS BUGGING THE CRAP OUTTA ME!