So my moms van is sputtering, started out of the blue. Rough idle but runs, little power - I don't feel safe taking it out on the road but just pulling it in and out of garage seems weak. Heavy gas smell and old plugs seemed wet. Cleared codes by pulling battery terminal and ran it. Get the codes in the subject. So far I have replaced the MAP sensor, plugs, wires, coil pack, new battery, check for vacuum leaks with carb cleaner, and I pulled the intake to check for the burnt wires on the fuel injector harness. The next two items seem to be PCM/ECM however I did pull it and no visible corrosion or short that I can see but packed in a gel so who knows. The other option I see quite a bit is valve spring which I would require a mechanic to do. Before I break down and take it to a mechanic, wondering if there is anything else a rookie mechanic like myself can try. The codes I get from doing the key three times are above, would it make sense to limp it a mile to Advanced Auto to read codes there - would I get any more info. Any help is appreciated.