Hey guys, first time GM truck owner and new to the site here. I just bought a 1993 Jimmy SLE with the 4.3 vortec. It was a deal I just couldn't say no to. The truck is in absolutely mint condition inside and out....almost show room with only 75,000 km (46,000 miles). It was an estate sale, the original owner recently passed away. It obviously wasn't used much, but apparently used somewhat regularly so it wasn't parked for an extended length of time, other than the last 5 months or so since the owner passed away. Anyhow it ran fine when I looked and subsequently bought it. But after driving it for a couple hours around town it slowly started coughing and sputtering, progressively getting worse to the point it would stall at lights if not keeping revs up in neutral. I took it home and parked it overnight. The next morning I put a code reader on it and came up with codes 32 and 43, in that order. Now I read the definition of those codes, but before I head out and put a new egr valve on, I'm wondering if anyone with more experience than I could maybe steer me on the correct sequence of things to look at changing/fixing. Thanks for any help in advance.