While Running

Maybe your engine needs a tune up.

I did that today. Plugs, wires, fuel filter. What else could use a tune up?

Use some fuel system cleaner like Techron, clean the throttle body and change the gas and air filters.

I had a similar issue, the problem was a vacuum leak. check all the hoses and make sure they are well sealed to where ever they are connected to. I know it makes no sense, but that fixed my problem. I took mine to a mechanic and he talked me into spending almost 200$ on new spark plugs and wires. at the end a simple cracked hose fixed the problem. good luck