I'm having a problem with my 1989 Toyota Celica ST with a 2 liter 3SFE engine. The engine seems to miss or stumble during acceleration or if the engine is under a load such as going up a hill. I have replaced the plugs, wires, and distributer cap. The car has approx 235,000 miles. The stumble seems to be more noticable when I first start up, but I notice it after the engine has warmed up also.

SOURCE: My 1993 Toyota Celica GT hesitates upon Acceleration

did they change the fuel filter??? if so then i would check to see if you have a miss in one of your cylinders this can be chacked as easy as turning your car on and going around the the muffler and listening to see if it makes a funny noise something like a low cough nothing loud just a little cough. if you cant hear anything like that take it in to a mechanic and have then check the pressure in each one of your cylinders
if it is not either one of those that i am not sure either hope it helps

SOURCE: I have a 1989 Toyota Corolla, 5 speed manual;

I would look at the fuel delivery system. Change the fuel filter if it hasn't been done lately. Also get the fuel pressure checked. I don't have the specs but it could be that your fuel pump is getting worn and occasionally has trouble pumping enough fuel to the carb. It's also possible that your carb may need to be overhauled. They do wear and get build up in the pasages over time. Also check to see if your warm air valve in the air cleaner is working. It is possible that your carb is icing up in the cold weather and it is more likely to happen at highway speed.
If you need to get the carb overhauled take it to a shop that specializes in this type of work. You will be glad you did when you get it back.
Hope this helps.

Muntejaya Ginting

• 10422 Answers
• Posted on Feb 01, 2011

SOURCE: 1995 Celica St 1.8L. Engine runs approx 10-15

Please check your coil for its spark. Observe the overheating on your coil when the car dies. If it has stranger heat and has poor spark, replace your coil with new one. Check also spark plugs and the wires together with distributor.
Regards, Jay