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on the back side of motor by firewall
In the right rear of the valve cover.
In the gas. Of course.
if it's the 3100 V6, it is on the right side of the front valve cover
anything over 100 p.s.i. is fine anything under and you either have a bad ring or a valve is not sealing...
Try replacing the idle air control valve (IAC)
The PCV valve on a 2002 Chevy Suburban 6.0 liter engine is located in the engine. You cannot miss the valve.
There is a big hose in the front valve cover it is at the end of that hose...
The PCV valve is located on the backside valve cover, its towards the drivers side of the valve cover, tough to get at not much room, just changed mine.
The EGR valve on a 1994 Chevy 1500 is located on the top of the engine. If the valve becomes stopped, the engine could idle rough or stall.
The EGR valve is located in the center of the intake, at the front of the engine, between the alternator and the A/C compressor. I've added a picture of the location under "Links". It is titled "Picture of EGR valve location, on 1996 - 2001 4.3L (262c.i.) Vortec V6 engines"
To adjust the rocker arms on a Chevy Beretta, first ensure the engine is cold and remove the valve cover. Then, rotate the crankshaft to bring the piston of the cylinder you're adjusting to the top of its compression stroke. Loosen the adjustment nut on the rocker arm, then turn the adjusting screw until there's no play in the pushrod, and secure it by tightening the nut. Repeat for each rocker arm as necessary, and reassemble the valve cover when finished.