what could be the problem?

ok when i drive my car, the first time i noticed it was today in second gear is where i notice it most, when i hit the gas the car kinda lunges back and forth like its shaking or not getting enough fuel and its kinda lacking power. now i notice it in third gear also. what could it be?

also, my heat doesnt work, if this is because my thermostat is bad, would that also make my temp guage read funny?

I have the same exact problem, my car lunges back and forth sometimes, in 2nd and 3rd gear as if not getting enough air or fuel!!I am gona try to change the fuel filter and see what happens.

btt, no one else with a similar problem??

changed my fuel filter and put in some injector cleaner, car runs fine now

also also check the vacuum line for the FPR, if its got a crack thats only sometimes open, like when you let off the gas and the engine moves in its mounts a bit, then it will loose vacuum and raise fule pressure sending the motor unexpected fuel causings it to buck.