Rough idle, stalling, falling gas mileage
My car started to stall occasionally when I would come to a stop of make a slow turn, but only before the car reached normal operating temperature. It has progressed to stalling during operating temps and the idle started to surge at all times. I decided to change the PCV, O2, TPS, MAF, and IAC sensors. I have also changed the fuel filter, plugs & wires, and all three ignition coils and cleaned the trottle body. The problem still is still there and is getting worse. My gas mileage has suffered greatly. I was avg 27mpg and now I avg about 14mpg. The idle is so bad now that the car will barely run in park with out giving it gas.
Other than the high consumption of fuel the car rides fine during driving. I did notice that idle is better if I disconnect the vaccum hose to either the FPR or the vapor canister. I have read many posts on similar problems, but I never found a real solution. Any ideas is appreciated.