My vehicle lacks power on flat roads as well as hills
My vehicle lacks power on flat roads as well as hills

My vehicle lacks power on flat roads as well as hills:

This usually indicates a problem in the ignition or fuel system or possibly a clogged catalytic converter. If the vehicle doesn’t seem to have the top speed it used to then suspect a clogged converter. If the engine runs roughly especially when idling it may be due to old/failing spark plugs and wires. Look for a fuel delivery problem in the carburetor or possibly a clogged fuel injector. Lastly, look for weak compression due to bad rings or valves possibly from high mileage.