I have a 1998 Toyota Tacoma 2wd 2.4 eng. When I first bought it I notice a rough idle. And at cruising speeds, the engine would buck. I gave it a tune-up ( plugs, wires, pcv valve, air filter). I didn't get to the fuel filter yet. The air filter was so clogged, that the mat sensor got dirtty also. I also replaced the o2 sensors. After replcaing all of this plus cleaning the mat sensor, the truck ran great. A full tank latter, it started to do the same thing. The check engine light never came on. PLEASE HELP!
Sunday, April 30th, 2006 AT 7:36 AM