Questions & Answers for: GMC Safari idle surges

i have a 1994 gmc safari.It seems to have a smooth idle at times The engine goes from smooth idle to small rough idle.I have replaced fuel pump,plugs and wires,most sensors,adjusted timing,filters. ...

Engine surges intermittently while driving--rate of speed does not affect this problem Any DIY ideas? please check on idling if there is a roughness. if so you will need to check fuel flow,injection ...

...a voltage divider circuit. IAT sensor values are used by the EMS to assist with the calculation of idle speed, fuel mixture and spark advance. Inaccurate voltages from the IAT sensor may affect

...surges when you reach 40-45 mph. A friend ran an emissions test and the carbon output is at 2193%. Yes you read that right 2193%. This thing is very quickly becoming a money pit!! So what is wrong ...

van surges/vibration when vehicle is idleing you need to change your motor mounts, they aren't that expensive, just the labor. 

...idling, in park or drive the engine has a cyclical engine surge. The surge rpm is equal to fast idle. The repeating cycle is 10 seconds normal idle, and 2 seconds surge to fast idle then back to ...