Ermond

I hope somebody can help me troubleshoot this problem. Five times in the last two weeks and four times in the last two days, it will lose power and pick back up lose power pick back up loose power pick back up. This goes on for about six times Then it clears up and runs perfect. It did it twice on the interstate at 70 miles an hour and three times on city Street at low speed. Low speed it will pop a couple times like spitting back an old carburetor would do. Except for this problem this little motor runs fine. 2.5 four-cylinder 1993 Cherokee