Try cleaning the mass air flow sensor . Don't know what kind of mechanic you take it to , but i would try another one . Hooking up a scan tool an viewing engine sensor data while it's acting up , seeing which sensor is bad is the best way to find fix.
SOURCE: Service Engine Soon Light and Rough Idle (Below 1200 rpms)
do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?
SOURCE: 2000 Chevrolet Venture multiple codes stalling and rough idle
Look for broke/ shorted wires on Crank sensor.. thanks
SOURCE: service engine soon light on 2002 chevrolet tahoe stays on
That normally means that you have a issue with your gas cap try replacing your gas cap first then diconnect the negative terminal of the battery for about three minutes to clear the memory and start the truck again
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