The other day my truck lost a lot of power. Under load it will start sputtering and stuttering and under higher rpms while under load it will backfire out the the exhaust. It also has carbon fouled the plugs. I'm pretty sure ( not 100% ) that it's either getting too much gas or not enough spark. The list of things I've replaced or checked is growing daily and I'm almost out of options: Spark Plugs - Replaced Spark Plug Wires - Replaced Cap & Rotor - Replaced Ignition Module - Replaced Coil - Tested, Only a year old Distributor - Inspected Fuel Pump - Replaced Fuel Filter - Replaced Carb - Disassembled and Cleaned Compression Check - 135 psi +-5 after 4 compression strokes, 105 psi +-5 on very first stroke Vacuum - Checked for leaks Timing - 8 degrees advanced, vacuum advance works The motor is a 350. I was wondering if anyone has any other ideas or what I'm really hoping that has a spare carb, distributor or coil I can swap out to see if that is my problem. I can't spend anymore money replacing things that don't fix my problem.