I have a 1993 pontiac sunbird. the check engine light keeps coming on and going off. i checked oil, transmission fluid...they are fine. what could this be?

it sounds like your oil pump is a gonner and if you keep on driving your engine will be too if its not too late already. stop driving it and get your oil pump checked

Check your fuel pressure. You could have a bad fuel pump, dirty injector, or leaky fuel pressure regulator. Hope this helps, James Booth

start by checking the ground strap to the engine, and engine to body. The oil pressure sender unit may be bad. You may have to hook up an oil pressure gauge to the oil pressure sender port to verify proper oil pressure. Senders are cheap- I would just replace it and go from there.

find out what code is setting. most auto parts stores can access the code for you

look white smoke is the engine burning some kind of moisture keep on eye on your radiator fluid not just the plastic bottle check radiator from the cap,

IF IT HAS A V6 CHECK THE CRANK SHAFT SENSER

IF OVERHEATING WHILE SITTING AND IDLING MORE LIKELY COOLANT FAN NOT COMING ON CHECK COOLANT FAN FUSE AND RELAY BUT IT. COULD BE FAULTY COOLANT TEMPERATURE SENSOR.LAST RESORT IF EVERYTHING CHECK OUT OKAY HOTWIRE COOLANT FAN.IF RUNS ELECTRICAL WIRE CONNECTOR HAS DAMAGE WIRES.IF FAN DONT RUN YOU HAVE TO REPLACE FAN MOTOR.

Check and replace fuel filter, also check your fuel pump pressure when the car is warm.

more than likely it has a hydraulic clutch. check under hood to see if it has a resivoir for clutch fluid. it isnt really big if it does but it will say on lid to fill with dot 3 approved fluid only if it does have one.

reddish fluid can be
oil (dipstick on motor)
transmission fuild (dipstick on transmission)
brake fluid (transparent reservoir on vaccuum booster)
power steering fluid (transparent reservoir on PS pump)
maker's dye choice for the fluid filled,
Check fluid levels and top up any that are below recommended levels immediately, then monitor fluid levels and fix any that show evidence of leaks.
The check engine light is an indicator, it just says that 'something' in the list of functions it is monitoring is not right. a code reader can be plugged into a socket under the dash to reveal the most recent error codes.
Many repair shops (around here) will read the codes for you gratis, in the hope of getting the repair job.