ok, the car is a '91 dx a/t...256,000ish miles (dunno exactly how many, my odometer hasn't worked since november)... for months now, the CEL has been on, i forgot the exact code (i'll try to get that today), but it said "TDC sensor". the car also hits the rev limiter at 3500 rpm, & won't go past 65mph-ish on the freeway. i've changed the distributor & ecu from another '91 dx that my friend had & wrecked, but ran perfect, changed the plugs & wires, too. no change. it hesitates when shifting, too. has the blinking "S" light on the dash as well. it runs ok, other than taking a while to start, & an oil leak (maybe bad headgasket). the engine was supposably rebuilt about 3 years ago, too. anybody have any ideas? i would really appriciate any help here. TIA!