i know im probably reposting this for the umpteenth time. but i have an issue with my 4.3L 2wd running rough at idle and at first accelleration after sitting for a few hours. im thinking egr valve. any ideas?

 

why do you think the EGR valve? It really could be a million things.

 

cause it only happens when cold. and once its ranf ro a few seconds and the egr valve has had a chance to unstick itself it runs fine

 

any lights on-one in particular..the check engine? thx, jp

 

no. and ive already scanned it for stored DTC's Im a auto tech for a living but i work on VW's so im kind of at a loss here. love blazers and love chevys but all my training is in vw wat different systems.

 

and now to add to it. its running hot and idk why

 

pull the egr valve out and clean real good with carb cleaner and then install new gasket with the screan in it to keep particles of carbon from jamming the egr valve open.

 

running hot doesnt sound good,mine did the same thing and i found out the head was cracked.you could try to pressure test the cooling system that should tell you if the head is cracked.i would also run a compression check on the cylinders.

 

that was all done last year when i replaced the intake manifold gasket that blew. tested good. it just started running a bit warm like 240 or so. ac is bad too but oh well. ill check into it tomorrow i hope we have a pressure tester at work that will fit my truck

 

ok no water leak didnt pressure test it but it hasnt run hot in a few days and its been scorching hot round here. and the rough start is a clogged EGR valve cleaned it with carb cleaner problem was fixed for a day or so but the valve is still sticking. and the truck is running rich as heck. yunkyard here i come!!!!!.