my truck was been running fine except a little hesitation periodically until this morning on the way to work about 10 miles from my house i was making a left turn and gassing it pretty hard and it started bucking very bad i put it in neutral and it reved up fine and ran finebut in gear it was awful i could only drive 35 and still bucking. after sitting for a couple hours it started up fine and ran for about another 10 miles and this time i was taking off on a right turn when it started bucking i made it to auto zone. when i went to start it up it wouldnt just turned over.in parking lot i changed the tps, fuel filter and put heat in it and it started up but ran the same . i think it just got cool enough to start.the egr valve looks new. the check engine light has come on intermitingly since i bought it and the guy i got it from said it was from a censor he kept replacing but light kept coming on idk also when i got home after the parts store in park it is doing the same thing when u hit the gasits as if you were hiting the gas and letting off of it over and over again

 

just pulled codes and i'm getting 13 and 32.

 

13 - Oxygen sensor circuit - Oxygen sensor voltage stays between 0.35 and 0.55 volts for 30 seconds when the TPS signal was above 0.55 volts. The engine had been running for at least 40 seconds with an engine temperature above 110? F.


32 - Exhaust Gas Recirculation (EGR) Circuit - EGR open command did not change the fuel mixture when the command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of exhaust gas.

Here is what your codes mean.

To me, yours sounds similar to mine when my EGR went bad.

 

mine is doin the same thing but anytime. Have a thread posted in the engine and tranny forum. But gettin code 34, If you get any closure on this please let me know what you find.Thanx