What are the reasons for a truck lacking power when going uphill and not responding to acceleration?

[Floyd]

The reasons for a truck lacking power when going uphill and not responding to acceleration: 1. Excessively rich air-fuel mixture. 2. Excessive engine oil in the fuel. 3. Poor sealing of piston rings or crankshaft oil seals. 4. Presence of water in the fuel. 5. Faulty spark plugs. 6. Overly dirty air filter. Additional information on troubleshooting and diagnosis is as follows: 1. Improper mixing of fuel and oil: If the mixed fuel contains too much oil or the oil quality is poor, the oil in the combustible mixture cannot be completely burned, resulting in black smoke. For two-stroke engines with separate lubrication systems, an improperly adjusted oil pump supplying too much oil can also cause the above phenomenon. 2. Excessive wear or breakage in four-stroke engines: This can cause oil to enter the combustion chamber, leading to excessive oil in the mixture. If the crankshaft oil seal in a two-stroke engine is damaged, it can also allow oil from the transmission to enter the crankcase and subsequently the combustion chamber with the mixture.