1991 Chevrolet S10 Q&A
1991 Chevrolet S10 Question: engine is surging for fuel
Worth a shot. May have poor fuel pattern out of injector that is causing this. with cover off and air filter out of the way you can look in under the injector mounted at top of throttle body. You want to see a nice cone shaped spray coming down, narrow at top and widens out. If you see dripping then you have a problem. Cleaner in tank may help but likely may need the injector(s) replaced. May be something else entirely. Check fuel pressure and volume. If you don't have gauge then have a shop do it. Maybe a vacuum leak, also. - raiderron
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New plugs, wires,