Back again w/this 88 Horizon 2.2L A/T Americana. I'd appreciate any assistance, tips or whatever to help me figure out what's wrong w/this car. The guy has 2 complaints: 1. It idles and runs rough when cold, and 2. It stumbles/hesitates on acceleration, when starting from a complete stop. What things can I look at to do the 'process of elimination' diagnostics to narrow-down the CAUSE of the problem, and finally pin-point it? Thanx!