Recently had a misfire and loss of gas milage replaced plugs, wires, oil, airfilter, still having problem maybe a vacum leak but i sprayed ether at the manifold and no idle change and still misfires any ideas
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replace spark plugs, spark plug wires, fuel filter, and add some injector cleaner to the gas. Any change? if not it could be something to do with your ignition system, or fuel injectors, or maybe even engine timing.
Are you sure they used the correct oil? If they put a thicker viscosity oil in it then that would explain some of your loss of gas milage. Did they change the air filter. A clogged air filter will also take extra gas.
P0445 Evaporative Emissions System Purge control valve circuit shorted
I guess the first thing i would do, is insure that all the maintenance on this vehicle was up to date. Do an oil change and a tune up. Make sure you use decent spark plugs as a fouled plug or bad oil could cause a misfire. After you do the tune up, try running it some more, if the problem persist, you may end up having to replace the coil.
The evaporateemission leaks. These, especially the the 442 can be either a loose gas cap or a small leak in the vacume system. Insure the cap is tight passed several clicks and listen the the motor as it runs and try to hear any leaks. If you find a leak replace the faulty lines. Also inspect the vacume line for cracks and breaks.
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The misfire can be caused by an open injector , injector pulg or circuit, bad spark plug ro wire lost compression as a burnt valve blown gasket ( antifrezze foulingthe sparplugs ) Low compression from overheating over mileage or flooding from injector leaking. Take out the number 4 plug and any other and compare what they look like if they don't look the same swich them and see if the miss moves to the cyclinder that the #4 plug moved to. If it does run good or misses on the new cyclinder change the spart plug with new and then look for loss of coolant or oil on plug wire carrect leak and try again