88 K5, sputttering/choking at low throttle.
 

I recently bought an 88 K5 Blazer that's been spittin' and sputtering at low coasting speeds and what not. Cruising or at highway speeds it runs fine, but when I'm backing into a parking spot or very lightly on the gas through a parking lot/etc it sputters and sometimes stalls out. So far I replaced the fuel filter, Spark plugs(Gapped correctly), wires, Cap and Rotor and ignition coil and still it's sputtering really bad at the lower idling speeds. Any ideas of what I should look into next? I check and don't believe I have a vacuum leak, the injectors seem to be spraying correctly I'm running out of ideas. And also, when we attempted to time it to 0 degrees as speced it ran like crap and had to advance it say 60 degrees or so to keep it running good. Has a Throttle body and 5.7 liter engine (350). Any help would be appreciated!

Hahahaha, just disconnected the EGR valve and took it for a spin. That was the problem, it's either really dirty or shot. Hope this may have helped some one lol