Engine Performance problem
1999 Toyota Camry 6 cyl Front Wheel Drive Automatic 170000 miles

I am getting a 300, 301, 303 and 305 engine codes. Check Engine Light blinks. There is a Foul smell from the exhaust and at certain speeds the car shakes. Changed all sparks plugs, coils and cables with new ones from Toyota. However, problem is still there. What's puzzling is that the problem (and Engine light) seems to stay on for 2 weeks, go away for 1 week and then come back.



Please help.. already have spent a lot of money and problem is still there.

Check your fuel pressure regulator. Based on the codes, your Bank 1 is flooded with unburned fuel.