hey all. i have a 91 GT 5speed with moderate mods. the last mod i did was install Power Products 75mm TB and EGR Plate, and now the check engine light comes on. the engine also has a rough idle, but it's probably not related and it can still hover about 800-1000 rpm, cold and warmed. the oil pressure is really low all the time (about the lowest and second lowest bar in the dash). my air bag light always flashes, but i have an air bag installed.
i mention these cause they are just indicators of something else:
the throttle dies and becomes unresponsive WHILE i'm driving. with no throttle, the engine slows itself and stalls if i don't clutch. sometimes it stalls after i clutch, sometimes it just idles. kinda dangerous to lose power steering in the middle of a turn! i let the engine sit and warm up a bit 2 days ago. i noticed that every so often the rpms drop to about 500-600, the check engine and air bag light turns off, and my oil pressure guage goes to off. then it will come back to 'normal' and i'll be able to drive just fine. sometimes it does it every so many minutes. once it did it 3 times; once every 30 seconds or so. when it happens the throttle is comepletely unresponsive and sometimes stalls when i press it. i have a blaster 2 ignition, and i checked the wires, cap and rotor and they're still good. i replaced my cracked distributor module too.
my theory: it drives fine until it revs low and my oil and the 2 lights turn off. does the computer run a self check on certain parts? so when it runs a check on the bad part, it bogs down and shuts half the dash off? any other ideas?