Question about 1998 GMC Sonoma

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I have a rough idle on start up and then it smooths out also im losing antifreeze with no sign of a leak at all

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I would suspect you have a blown head gasket. This is very serious and must be repaired immediately or serious engine damage will occur. A compression test will verify if you have a blown gasket. Stop driving the truck until you have this repaired.

Posted on Sep 25, 2009

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Could be a idle air problem. The injector could be leaking when you shut it off ..Try some injector cleaner see if it gets better..The idle air shouldnt run rough just idle real low or sometimes it will get stuck and idle high....Are you losing any antifreeze..If you are the 2.0 SOHC engine bad about leaking antifreeze into the cylinder and makes the engine run rough until it burns it out..See if you can see the smoke coming out when it happens..White smoke indicates antifreeze,,Black smoke indicates fuel..

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