1993 gmc jimmy idling rough?

[Sonia]

and seems as though its revving itself in a pulsating mode while idling and driving on road.rpms between 7 and 10.when its doing this on the road truck is bucking and check engine light is on.

 

[QuadFreak400ex]

go to oriellys or auto zone or any auto parts store and ask them if you can use one of their code readers. most won't check it for u but run the code and then look up the code on the internet. thats the easiest way to find out whats wrong

 

[Molson02536]

and seems as though its revving itself in a pulsating mode while idling and driving on road.rpms between 7 and 10.when its doing this on the road truck is bucking and check engine light is on.

Here is link that will give you instructions on how to check for your DTC codes. Once you have those codes, you can address the issues that your engine has that is causing your problem. Keep me posted, be glad to help you get your jimmy running 100$ again soon. http://www.troublecodes.net/GM/