My ride is having some issues, here's whats going on with my 99 Rodeo 3.2 auto 4x4...It has ran perfectly until today. Went for a drive to the hills, noticed sluggish acceleration and poor performance on hills (paved) even with power mode on. After stopping and taking a break, went to leave truck would start and die. Did this three times until I kept it revved enough to stay running. On the way home it remained running even at stops, however it idles at about 500rpms now. I had autozone try to pull trouble codes, no codes were found. The intake manifold gasket has been replaced already. I'm at 50,000 miles so any ideas as what to look for would be greatly appreciated.

Thanks

Tim B.
99 Rodeo