Sudden performance degradation 2001 LE

[STF]

Hi guys, need an advise or a pointer for a strange problem.

History: (all repairs are made with original Toyota parts)

about a year and half ago my car had a bad spark plug, all plugs and plug wires were replaced. Then in about few weeks acceleration virtually disappeared, I pressed gas pedal but car was barely accelerating. My mechanic hook it up to a tester and we got all sort of error codes, which was caused by a sensor that was part of the gas canister. After replacing the canister everything went back to normal for about a month. Then I was getting intermediate shakes, no error codes, nothing happened when mechanic was nearby. After 2 month of this behavior, Check Engine light comes on and it was pointing to EGR. EGR was locking up in one position and was replaced, then after a week EGR solenoid was replaced as well. Since then, there were no error codes, but acceleration had never recovered and MPG drops from 24-26 to 17-18. Also while driving up and down the hills It feels like car is choking a bit and extra acceleration is needed.

I will appreciate an advice on this matter.

P.S.
Temperature sensor was replaced as I had similar acceleration problems with my 94 Camry caused by faulty temp sensor so I asked my mechanic (despite his advise) to change it as well. Air Filter is replaced timely, Oil changed with fully syntetthic every 5k miles

[whip_cracker]

This might sound stupid, but make sure the plugs are all good mate.

I had this exact same problem around 3 weeks ago... it was a plug on it's way out. It started by "coughing and sputtering" when on a small incline up a hill when in a higher gear. The next day this bad rumbling started happening ALL the time. Found I was running on 5 cylinders instead of 6.

Normally you'd pull the plugs out and see if they're "white" on the end.

I don't know if that's the problem, but sounds very similar to mine.

[-=]KaiN[=-]

what are your long and short term fuel trims? Chk for holes or cracks in vacuum hose from intake manifold to map sensor.