i recently got a 2003 Stratus with the 2.4 liter DOHC engine. when first started cold the engine runs good for a few seconds then as the engine gets warmer it starts missing, and missing more the warmer it gets. It had code P0172, rich on bank 1. It's had new plugs, wires, camshaft sensor etc. It was a fleet county owned vehicle and recently had a new timing belt installed. actually runs pretty good while cruising down the road, but skips badly at stop signs. Any ideas as to what I might need? My research is leaning towards checking the timing on the exhaust cam, I don't really want to pull that down. Thanks