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Rpm surge will not hold steady need to smog

(1990 Ford F-250)
in Carlsbad, CA on January 29, 2015
At idal or giving gas rpm will surge
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Popular Answer
on January 29, 2015
Sounds like vacuum leak. Check engine light on?
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of Cornerstone Automotive on January 29, 2015
A SURGE INDICATES THAT THE FUEL SYSTEM IS TO RICH OR LEAN,THE COMPUTER IS COMPENSATION BACK AND FORTH.A VEHICLE THIS OLD WILL NEED ADVANCED DIAGNOSTICS.WE CAN GET TO THE ROOT CAUSE CALL US 760-757-9615.
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