I have a 95 s320. Been sitting at a parts changer for 3 weeks and nothing positive from them yet. I had a multiple cylinder misfire. I repaired by new plugs,wires,coils. Ran good for two days. I changed out the fpr also cause it was bad. I drove the car in the am one morning 15 miles parked it went inside for 10 minutes and started it and it was reving up and down in all gears. I couldnt figure it out so took it to parts changer. We haved cleaned throttle body ,injectors, rewired a few bad spots we found (harness behind block) checked all the wires for burnouts from male and female plug on throttle assembly and harness. All check good from pins to plug. Checked fuses in trunk and under hood. Ecms show to be good also. Changed maf sensor and no change in idle. If i turn on defrost like putting load on engine it will idle down a small bit, but doesnt when turn ac on. If you give it throttle it sounds like its gonna die like choking out. We have also used throttle body cleaner to check for vaccum leaks. Check engine light is on. Any thoughts? Besides sell it. We have disconnected batteries and left driver door open to drain ecms. If you try to drive it it wont go over 10 mph without dieing.

Thanks for help in advance!!

vac leak somewhere?

Still same problem persist. Feels like im chasing a ghost! Now i have replaced the wiring in throttle body so all is good on that end. With a snapon computer we get code 104 and 99. My thoughts were maf sensor with this code but have replaced it. Wiring is good there also. Wiring harness for engine is good also. Did notice a real rich smell from exhaust pipe im mean like burn your eyes rich! . Coils, plugs,wires are new. Still when accelerator. Pressed it wants to choke out and out and revs from 1000 to 3000 up and down fast untill you let off pedal then goes to a half *** idle. Has anyone experienced this crap?

check you catalytic converters for blockage.