Had bad mass air flow sensor. New one fixed rough idle and missing at high speed. By the time I replaced it most times when engine starts, a cloud of bluish smoke comes out of tail pipe. When warm the exhust is a little black and often hear solenoid buzzing in engine compartment. But seems to run just fine. Just replaced PCV valve and took off EGR to look at. Valve seems to move freely except when pushed full open then sticks. Is this normal. any way to tell if EGR is bad. Any thing else it could be? Just getting ready to put EGR back on and start up.
Thanks.
Thanks.