I've got a 93 Isuzu Trooper that is giving me a check engine light intermittently in the morning. Again, this only happens in the morning and is intermittent. When the car idles, I get no check enging light. When I accelerate, the check engine light comes on. In the afternoon, when the day is warmer, the check engine light stays off. I took the car into the dealer and was told this was the EGR valve so I have removed and cleaned the valve but am still getting the same check engine indicator. I am going to try and replace the EGR valve but was wondering if anyone has seen this before and could offer some advice before I go through the trouble and expense.