Replaced my valve cover gaskets and after I had the engine back together my engine had a rough start, initial high idle then very rough idle.
Is there something I may have overlooked in the vacuum system or a part that I may have damaged?

 

What year Ranger?

What engine size?

 

2002 Ranger ALT 4x4
4.0 sohc

 

PCV Valve hose is the most common vacuum leak

Starts here on the drivers side rear of engine, PCV Valve location: https://s48.photobucket.com/user/dma...arrow.jpg.html

Then the hose runs around the back of the intake to passenger side and to the front, pictures here: https://www.ranger-forums.com/4-0l-o...mon-cel-93776/


The PCV hose and the Power Brake Booster hose are really the only hoses large engine to cause the rough running, smaller hoses can cause high idle

Make sure you didn't hook EGR valve to wrong Vacuum hose, that can cause it to open a bit and you get poor running