1991 chevy 1500, changed almost everything and still misses going down road sometimes, can't figure it out, please help.

Asked by Apr 29, 2014 at 11:04 AM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

we have changed out almost everything but still runs rough & misses going down highway. does fine in idle and at low speeds , this happens on hwy, loses speed sometimes all the way down to 35 miles and runs real rough, just can't figure it out running out of options???

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15

having same problem on my 2000 5.3 vortec if i can get it cleared up i will let u know

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