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I have done a full tune up exception of the timing chain new catalytic converter with a throsh glass pack and only 145 thousand original miles no I have not done a compression test and the tune up was done resently wires plugs oil.oil filter gas filler charcoal canister was replaced tremestat was replaced also new air filter checked all vacuum leaks still hear some kind of vacuum leak coming from under the efi but not sure
Vacuum leaks will react to WD-40 being sprayed in the general area of the suspected leak while the vehicle is running.
ADVISO ! WD-40 is Flammable ! Be careful...