I purchased a rebuilt carburetor from Carburetor Exchange in Peoria,AZ. When I put it on my '84 Jeep Cherokee the car would not run, I could not get it to idle and it ran very rough. I took the carb to Speedo/Electric and they fixed the carburetor. It did cost about $1000 plus $350 for the "rebuilt carburetor". The carb had a broken Throttle Position Sensor, a stuck on full rich mixture control valve{$256 for part} and an inoperative accellerator pump.So now the car runs great and it passed the smog test.Speedo/Electric really is good. They truly try to do a good job.