03 sonata 2.4 died on the interstate, got it towed home, changed fuel pump, crankshaft position sensor. will run now(rich) as long as I keep the rpm's above 1000 or so. can not figure out what the problem is, there are no codes. I am thinking throttle position sensor, oxygen sensors, idle control valve, or catalytic converter. Any help would be greatly appreciated, have been screwed over by a few local mechanics and do not want to have it towed somewhere else just to be taken advantage of again.

another thought is a stuck exhaust gas recirculation?

 

I Had this issue with my 2003. The issue was the fuel pressure regulator.