87 k5 350 tbi. Put in new plugs,wires,cap,rotor, fuel filter and air filter, it Ran great. Then started stalling out at idle. Used the paper clip trick and found o2 sensor reading rich. Also map sensor voltage was high. Guy i bought it from told me that he had just replaced the map sensor. Replaced o2 sensor. IAC valve and Egr Valve with same size washer as before. Afer all of this it seems so run rough and does not want to idle. Haven't even driven 3000 miles yet and it has been about 2 months. I just don't think it's possible that i need new plugs again and i can't think of anything else. Also just flushed the radiator and installed a new thermostat. It seems like the more preventitive maintenance i do the more goes wrong with it.