1989 V1500 5.7L 1) What is the differance between the SLE and the Classic? version? 2) After resetting my timing to 0° and replacing my Cap, Rotor, and Plugs using all AC Delco parts my Sub seems a bit down on power and needs more time to warm up before driving. When I do try and dive after a 30 second idle warm up and I put the Vehicle in "D"rive and apply throttle the truck dies almost like I am flooding it? I am thinking of advancing the timing up a few degrees since when it was running stronger it was WAY off from my timing mark on the engine block. I am just not sure if that is the proper fix or if the P.O. did that as a band aid fix. The old plugs were worn down to .65 and I gapped the new ones to .35 3) How do I go about getting the OBD 1 codes with out a code reader or do I need a reader in order pull codes? 4) LMC be the best place to get the window and door rubber / weather seal or is there a better source out there? Thanks peeps!