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I recently purchased a 2004 Chevy Silverado 1500 with a 5.3. Get a blinking CEL on acceleration. code reads p0102 and p0307. I already did a tune up on the truck, new plugs and wires oil change. truck has 189,000 miles. the kid I bought it off did god only knows what in repairs. the evap purge hose on the top of the engine was replaced with heater/fuel hose goes back behind the engine to a hard pipe. the evap canister underneath the middle port has a random hose going to what looks like a 3 port filter connected (I'll see if I could post a pic). it definitely has a rough idle. also not sure if I here a hissing noise around the manifold. does anyone have a vacuum diagram of the evap system the hard pipe the purge valve goes to seems to go direct to the tank.