I just acquired a 1989 NA 7mge....was told the TPS needed replacing. When I first drove it, the idle would bounce from nearly zero to about 2k....when I unplugged the TPS, the engine idle went sky high....thought it was boing to blow before I got to the key. I do have code 51 and I hear the ISCV click when I turn it off. I have tested the tps with an ohm meter and it seems fine. I'm not certain that the cables and screws weren't messed with on the throttle body, but everything looks fine....anyone have an idea what I should check next?