The cold start valve should look like a ninth injector, on my car it is located at the left front of the intake manifold (it might have been relocated in later models). As far as fuel treatment goes try to find Red Line Complete Fuel System Cleaner. Not sure where you'd find it in Jackson, I get it at Pep Boys. You might be able to get it here at PartsShop.
Start with a complete bottle for initial dosage, then follow the recommended amounts on following tanks. This stuff works good. Costs about $5/bottle.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.