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Tahoe running rough
I have a 98 Tahoe with the 5.7L that is running rough. It has a rough idle, and surges some. It has been throwing code P306 and once in awhile P300. I am home on R&R so I dont have much time to figure it out. The dealership did a tuneup on it a few months ago, new plugs, Distributor cap and such. Any ideas would be a great help.
Also have another question. How much vacume should there be in the engine itself. Im not sure if its related to the running rough or not. But there seems to be alot of vacume in the crankcase. If its running and I remove the oil filler cap or one of the lines that run into the valve covers it will idle way down and die. If you put your hand on one of those line or the filler it will suck it on and stay running. Used to have a 98 Silverado and I dont remember it doing that. Thanks in advance.
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Shane
'05 Z71 H.O. 5.3
Flomaster muffler and custom dual exhaust, Volant cold air intake, Dual Optima Batteries, Edelbrock Headers. Back in Iraq again. 
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