1990 buick skylark 3.3l ghost codes wont go away

does the temperature gauge show engine is very hot? could be a stuck thermostat, did you check for engine codes? this can be checked for free at most chain auto stores and give you insights into the problem.

first option is to have the fault codes read as they will determine the area of the fault
indicates a problem crank or cam shaft position sensor or wiring

Fuel Pump

that must not be original motor maybe. I'm sure there can only be two or three diff motors. take old one in with you and pull all avail starters for that car and match it up.

IT IS IN THE FROUNT OF THE CAR LOOK UNDER IT

maybe some kind of alarm or a blinking light to make people THINK it has an alarm???

You seem to have a bad head gasket. Check the exhaust,while running,to see if white smoke is
pouring out.Get it checked out ASAP,since you don't
want to severely damage the engine any further.
Good luck.

Say did you check to see if there is a vacuum line running to the transmission ? if there is follow it and make sure its connected on both ends this might be your problem with shifting hard .. It is connnected to your vacuum modulator and it controls the smooth shift.. Also if this line were off it would make your car run crappy .. Say check all vacuum lines on your car to see if they are good and no cracks.. after all the car is 19 years old now and time for those to crack and fall off.. thanks and holler if you need more Jerry

What motor does it have? If it is the quad four, you probably need to replace everything under the cover. If it is the 2.5, check your firing order/timing.

replace ignition coil make sure by dealer the right mode is used when ordering if not ordered right you will get a difference in engine volts