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chk eng light after long hill pull no code?
2002 f-350drw crewcab stock 7.3 manual trans
runs fine but when i pull a long hill the check eng light comes on? it will never do it without towing a trailer but when i tow my camper flat land it never comes on but when i start up a long hill with a load (camper)by the time i get over it the light comes on if i ease over the hills it wont come on and it gos out in a little bit if i dont pull ahilll very soon after it comes on.i have been to autozone and it never show a code!!
can someone tell me what might be wrong????????????