2004 Hyundai Santa Fe 6 cyl four wheel drive Automatic 68000 miles. I bought this car used with 65,000 miles on it. Recent problem after completing 60,000 mile maintenance (timing belt, two other belts, plugs, wires, changed tranny fluid). It ran fine for 1,400 mile trip and return home after a few days and suddenly engine is missing at idle. Codes say 1, 3 and 5 are the problem. Could it be a bad sensor? Fuel pump? My mechanic who did the maintenance is stumped so far. Any help would be greatly appreciated.
follow up)Turns out that the timing belt had jumped three teeth for absolutely no reason. My mechanic reset the belt and it appears to be running fine. Thank you for all of your suggestions.