I have '97 GXE and have few problems with CEL off and on. One thing I am noticing currently is that in Summer time when outside temperature is high, and I've driven for more then an hour. Especially on the freeway sitting in traffic jam with an air on.

Engine looses power drastically; engine knocks whenever an accelerator is pressed and engine temperature rises (not to the dangerous level but higher then normal). But then when the stop & go traffic is freed, the problem goes away.

Anyone with a similar experience what the problem might be? Thanks inadvance for your reply. :shakehead