Any suggestions appreciated. My 97 F-150 with a 4.6L has been acting up. Missing terrible then levels out at higher RPM's and almost completely goes away after the truck has been driven for 20 or 30 minutes. Ironically, runs pretty decently after sitting overnight, but the trip home from work is a bear. I've changed plugs, wires, fuel filter, air filter, and recently fixed the broken EGR tube. I'm still getting the famous insufficient EGR flow code that I assume is from clogged EGR ports at this point. I also get a couple of "system too lean" codes. I also used some Lucas fuel treatment in it. Each and every step has improved the miss, but it's still there. Where should I go next? I figured I'd check out and clean the MAF sensor tonight. Any tips or guidance would be appreciated.