GMC Repair: Power loss, air induction system, decarbon

Question
Hi Jim
I have a 1989 Chevy 3500 Silverado with a 350. During the cold months I have noticed a problem with acceleration. When i am at a complete stop, and press the gas pedal to accelerate, the truck rolls foreward as normal then it reaches a certain speed or rpm and I lose the consistent increasing speed. The truck losses power. I have to then add more gas to increase the speed so it can maintain a steady incline.   

However during warm months or when the truck is at normal operating temperature all is fine! Any ideas on what this is? Thanks ! Patrick

Answer
It sounds like you may be in need of a major tune-up. You may also want to look into an engine decarbon and/or injection system flush. Try to put in some fuel additive to clean you injectors, and I will explain how you can also decarbon the engine at home.

The way that I like to do an engine decarbon, which is how I do it on my 1998 Tahoe, is to go to your local GM dealership and get a can of GM spray top engine cleaner, and a can of liquid top engine cleaner. Take the air induction off of the truck and start it, spray the first can into the throttle body making sure to manually work the throttle to keep the engine running, and clean the throttle body. Next, pour the liquid top engine cleaner into the throttle body, again keep the engine running, and when the can is about 3/4 empty dump the can in and let it stall the engine. Put the air induction system back on the truck and disconnect the battery to clear ant codes set by this and let it sit for 30 min. Then start it up, this will be somewhat difficult because it will be flooded, and drive it. Try to keep the RPM's high for a while. There will be alot of smoke coming out of the tailpipe, drive it untill the smoke is at least almost gone and see if it better. If not get back with me. The top engine cleaner should be about $7-10 each.