Intermittent Check Engine light

[Rick Rickman]

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Hi all. On my 1993 90 CS Quottro I get an intermittent MIL (Check Engine) light
when cruising on the highway and accelerate slightly . I have not had this
happen in city driving only highway driving and only after cruising at steady
speed for a while. If I put the clutch in and let the engine go back to idle
the MIL goes out performance returns to normal. The fault codes are
2342,2341,2332,2331 some times only 2331, 2341 are set. The o2 sensors were
replaced no change not likely that both would fail at same time. I replaced
the seal between the air box and throttle body. Evap purge valve appears to be
ok. I don't know if it is a lean or rich condition that causes the problem. I
have not checked the fuel pressure yet. Any thoughts ideas ?????

Many thanks,

Rick

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