emission control causing rough idle?

slantsixdan said
If you decide to install a new EGR valve, you can update to a more advanced type that is a direct bolt-on. Standard #EGV490; RockAuto's got them on sale for under twenty bucks and you can knock that down further with those 5% RockAuto discount codes that are always floating around. This valve has a backpressure transducer that modulates vacuum to the EGR valve to match EGR flow rate better to the engine load. Takes a smaller bite out of driveability than the non-transducer type valve.

I WENT OUT AND FLIPPED THE VALVE, NO CHANGE NOTED. When it stops freezing here,..yes freeze and snow in Houston believe it or not, I plan to check for slop in the timing chain. No vacuum leaks detected, but manifold fitting really sucks in the air when uncapped. I'm starting to lean toward a timing problem, or an alternator output problem. How far should the pulley travel around before the rotor turns?

Thanks Dan,

Gary