A common complaint with the Chevy 4.3 engine is that it doesn't idle well, it's loud and makes awkward noises. Examples of this are staling, lurching and poor acceleration. Poor idling and loud engines usually go hand-in-hand. Chevy 4.3 engine are known for making bad throttle control switches (TCS) and Idle air control valves (IAC), which would cause all these problems.
Idle Air Control Valve and Throttle Conrtol Switch
Open up the hood and look at all the wires, spark plugs, tubes, vacuum lines and valves. Look for corrosion, breaks, exposed wires and loose connections. Considering the Chevy 4.3's reputation, the broken wires and valves you find are probably related to the IAC and TCS. However, It's best to double-check your car's manual to pinpoint exactly what you are looking at.
Check Your Oil
Before you jump to the conclusion that your Chevy has a problem with the IAC and TCS, check the oil! As obvious as it may sound, many people may only get their oil checked once or twice a year. If you have an older car, you may need to check your oil every other week. Lack of oil will cause a knocking sound in the engine, stalling, poor acceleration and eventually engine break down.
Lack of transmission fluid, battery fluids, radiator and cooling system fluids can all cause symptoms that mimic bad idle air control valves and throttle control switches. Checking your vehicle's fluid levels is always a good idea to maintain the overall longevity of the engine. Once you have ruled out all the basics, you can go back to what the Chevy 4.3 engine is known for: bad idle air control valves and throttle control switches.
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