transmision problem ???

[jimmy[the]gent]

the car is an 89 toyota tercel 4cyl automatic bout 205 000 km on it

ok so i no my car only has a 3 speed transmision...

wen i drive the car everything is fine on accleration as i gradualy go faster i see it shift from first to second and both those gears are fine but wen it gears up to third gear low end side of it is fine but wen i give it more as i reach above 2.5 grand in revs (i put a tach in it) it starts jerking back and forth and it sounds like something is cloged [i am forced to ease of the gas and let the revs go down] but wen i stop the car and give it realy high revs in neutral that jerk doesnt happen

i chekd transmision fluid, engine oil, coolant could it be the transmision or something stupid like air filter or spark plugs wich i admit i havent changed in almost a year

i am very concerned any help would be greatly appreciated

[public]

Check plug wires and the fuel filter. Both will usually cause this under any load even at lower gears but I have seen this before. Under load at that speed your timing is advanced way around and will sometimes a weak plug wire will misfire. At this speed and load you are needing a lot of fuel and a partially clogged filter may not meet this demand. Good Luck.

[jimmy[the]gent]

i drove it again and the problem has gotten worse i hit the high-way to see how bad things realy have gotten i was doin fine wen the car was going under 100 km/h soon after around 110 km/h the car started jerkin again and soon after the road became a huge hill and i almost didnt make it up and almost broke down the jerkin was so bad [reduced speed to 40km/h and jerkin was stil happening]

i am almost certain you are right public because wen i have situations were i have to give the car alot of gas when i need power out of the engine its like it doesnt want gas and jerks back and forth

[public]

Bad plug wires will get worse pretty quickly. The electricity just keeps burnin the hole bigger. Can also be a coil. If it is the coil or wires it will get to where it does not want to even idle. You can then raise the hood a night and start the car. It will look like a disco in there.

[jimmy[the]gent]

thanks alot for your help public i wil most def check those things out

[public]

Glad to help a "Gent"