I have replaced the injectors mass air flow meter plugs, wires electronic
fuel pump, pressure regulator, TPS, the engine starts and runs well at idle,
but hesitates on acceleration, and backfires.
The only way I can stop the hesitation is to restrict the return fuel to raise the fuel pressure.
Im having the same issue cant figure it out my fuel pump cuts off when it hesitates and the bucks down the street wires seem good and so is pressure. Hopefully one of us finds a fix...
I had the exact same issue and it was driving me nuts. I had no check engine light.2001 Toyota Avalon 3.0 V6. My car was hesitating but more like a chug feeling only on acceleration. The harder the acceleration the more noticeable it was. My wife drives the exact same car and it runs perfect. So I thought I would start swapping parts, mass air flow sensors etc. but one thing at a time. It ended up being the bank 2 02 sensor that's located at the front of the engine. I was so happy, my car runs perfect now since I replaced it. I had no issues at idle or low speed acceleration, no rotten egg smell as everyone on here describes.