[Steeveedee]

More than likely it's the accelerator pump. With the engine off, look down the primary bores of the carburetor and crank the throttle open. You should get a healthy pair of streams of fuel from the pump jets. If not, either the accelerator pump is worn, the transfer circuit is clogged, or your float level is set too low. It won't be the fuel pump if it straightens out and runs OK after the coughing.