wrote:
>
> Three years ago at the state auction I bought a 2006 Chevy 3/4 ton van with a 4.8
> engine.It was in real nice shape and at the time I didn't need it so it has been
> sitting outside in my yard. I realize this wasn't the best choice but I had no where
> else to put it. There are a couple of things that you should know about this van. First
> it was not started during the three years that it sat on my lawn. Next it presently has
> a full tank of 87 octane gas that I stupidly put in three years ago before I parked it.
> The battery of course was completely dead. I charged it at three amps for two days and
> quite surprisingly it came back up and cranked the engine. The truck started right up,
> another surprise.
>
> The problem is when you first start, except for a very slight shake the engine seems to
> idle fine. if you goose it it seems to rev fine too. As soon as you shift it into drive
> though the RPM's slow way down, the shaking gets much worse, (the engine even stalls
> sometimes) the "engine" light blinks constantly and eventually stays on and when read
> it's a "random misfire" code set on the OBD..g. I took it out for a short run today.
> It seems OK on the flats but acceleration is "bumpy". It is missing and it really
> almost dies on the hills.
>
> I've gotten all kinds of opinions as to what this could be. Of course the gas was one
> thought. But if it was the gas would it idle fine in neutral with no load initially?
> I've also heard plugs was another thought. But again if it was plugs same argument as
> the gas? Then there is Mass air flow sensor, vacuum leak fuel filter etc. I hate to
> think about shotgunning this problem. Does anyone have any thoughts on what this might
> be and what steps I might take to isolate it. Thanks very much for any help. Lenny

Clogged fuel filter, failing fuel pump, clogged cat.