need help

[dvx304racer]

Hi i have a 2001 toyota corrola and it has problems. It runs rough like almost surges from 1100 rpm down to like 500 or 400 the light dim down nd sounds like it wants to stall. I also have no power when i come to a stop and start to accelerate it almost just wants to die, sometimes it does stall out. It had 171 bank 1 lean and 301. So i changed the o2 sensors cleaned the mass air flow sensor and replaces the fuel pump. also replaces the #1 coil for the misfire. Its still the same and now i can smell gas. Didnt get to check the codes since then put the mil is on and sometimes flashes when goin up a hill. Any help at all will be much appreciated.

[fishexpo101]

A flashing CEL is an indication for a critical component failure. In this case, sounds likely to be misfiring.

You mentioned that it runs rough from 1100 and down, how does the car run at higher revs, does it run smoothly then? Need some details on the car - what was its maintenance history, problem just started or did it get progressively worse over time, how many miles are on the car, what mods if any you are running?

Could be anything from a vacuum leak, dead/faulty O2 or MAF sensor, worn plugs, dead/stuck injector(s), VVTi failure, etc.

Cleaning the MAF first is a good idea, but replacing the O2 sensors and fuel pump may have not been necessary. If anything, they add more stuff to diagnose, as sometimes new parts are faulty out of the box.

First thing I would do is to pull the spark plugs and read the ends. See if there are signs of fouling, detonation, if they are in the correct heat range, excessively worn, etc. This engine is pretty picky about certain parts and their conditions - if the plugs are prefect, but the gap is slightly off, driveability can be affected.

[dvx304racer]

well it has 150,000 miles on and the problem started a while ago but was never as bad as it is now. I changed the oil every 3000 miles changed the air filter when is was semi dirty and the plugs were just changed. as far as a vaccum leak i cant find a single 1 sprayed carb cleaner to c if it changes idle at all and nothing. also what do u mean by higher revs i mean if you pumch it it goes to bout 3000 rpm then just sits there almost like bouncing off a rev limiter.