OR MAYBE YOUR GAS FILTER LOCATED UNDER YOUR OIL FILTER, PANEL UNBOLTS UNDER RIGHT FENDER WELD FOR EASY ACCESS, THE BIGGEST FIX FOR ME WAS TO TAKE OFF THE ADVANCE AUTO BRAND NEW SPARK PLUG WIRES AND INSTALL NAPA WIRES, DISTRIBUTER, ROTAR BUTTON, AND NGK ORIGINAL SPARK PLUGS. ROB
319 views
Usually answered in minutes!
grab a can of carb cleaner and spray it in the vicinity of the suspect vacuum leak. if engine idle changes (surges or coughs), then it is a vacuum leak. keep spraying in different areas to pinpoint it.
when idling, the engine is at its highest vacuum. I had this happen to my truck and it turned out the intake manifold gasket was leaking around the intake runner to cylinder 4. It ran fine on the highway but idled very rough as no. 4 kept missing. Pull your spark plugs and see if any of them are carbon fouled--that cylinder is probably missing at idle due to being too lean. When it misfires, the unburned fuel ends up on the plug.
If you have changed all that then I would say you are probably right vacum leak is next . Also try running some Chemtool cleaner in your fuel tank to clean up all fuel system.
×