I have a 2003 chevy silverado with a 4.3l that has over time lost alot of power. Does anyone know of an inexpensive way i can get power back to my old truck?
First thing you need to check is the exhaust back pressure, that is something that will slowly increase over time and will slowly reduce engine performance, have you checked compression, replaced spark plugs, air and fuel filters, checked fuel pressure and flow. Do you have a lot of blow by from the crankcase there are a lot of engine basics that need to be covered before you can really say what is wrong.
Check the valve timing. Perhaps the timing chain is worn and stretched causing the valve timing to become retarded (late). Check the knock sensor circuit for proper operation. Especially if you've developed a valve tap. HTH.Jim-Jim