Need help with 4Runner
I have a '91 Toyota 4Runner, that revs up and down while idling. Also, while I'm driving, if I try to hold a constant pressure on the gas pedal.. the truck will "jump" or "buck". But when I am speeding up, (or not giving it gas at all) it will drive smoothly. Every once in a while the 'check engine' light will come on. The gas is just being eaten up, and I can smell fuel when I'm staying still.. I think from the exhaust. Anyone have any ideas on what is going on? I thought maybe the TPS was causing the jumping and revving, but when i unplugged it, there was no change. Also, I was curious if a bad O2 sensor could be causing the fuel to be used so quickly and have to do with the smell of fuel. I haven't tried replacing that yet, I just wanted to get any ideas before I went to pick up some new parts. Thanks in advance!