Hello, I've tried three times to pass emissions in NJ without luck. 1990 Chevrolet K1500 w/ 350 V8, Thottle Body. I'm failing low idle for hydrocarbons (not burning all fuel) at about 1000 level when typical is under ~200 Fast idle is okay i've replaced the cap, rotor, plugs, and wires. There are no codes in the engine, when i check key on, i just get 12 (no distributor pulse) and when key is on, i get a bunch of fast blinks which doesn't stop. Hopefully i'm checking this right? I've only had experience with ODBII and not much of this ODB1 I can't seem to find any vacuum leaks spraying around brake cleaner. About the only thing that happens is when i spray kind of near the throttle body itself it changes speed i think just because it's getting into the throttle body (air cleaner off). I would have expected an EGR valve to throw a code (or general emissions code). I've sea foam'ed the throttle body a few times (almost a whole can). When i removed one of the vacuum lines from something i'd call a "bulb" on the drivers side fender well, the engine sped up. Ideas folks? I'm kind of at a loss. I could use the "always pass" additives, or just go to a shady mechanic but really want to fix this one. Could it be the PCV valve? Do you have to remove the throttle body to get the EGR valve off on this engine? It's really tucked back there and i don't see how one would get a wrench on the head without either removing the throttle body or at minimum the fuel line in the back. I also notice that one of the things i'd consider where a line may go on to be blank or empty? what should all connect to the EGR in terms of lines? I see one from the carb to the valve, then the electronics. I'm still thinking the EGR should throw a code?