I bought a 92 mustang lx convertible with the 2.3L engine and an A4LD tranny. Car was in great shape only has 47K original miles got it for a steal because the lady couldn't figure out what was wrong with it. The Car will start every time idle and rev in park or neutral once you put in any gear the car will barely move sometimes I can get it up to 10 MPH but the RPM's never go over 2K. I initially thought bad tranny, so I swapped it, does the exact same thing. I changed the MAF, IACV, TPS, and Neutral Safety Switch. We checked for a plugged Catalytic Converter it was fine. We put it on a code scanner the KOEO test came back clean the continuous memory test came back clean, am going to run the KOER test tonight. Anybody know what this could possibly be?