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.