Would like to know why it won't pull. on 2001 Mazda Tribute

It happened once before,,approx 2 months ago. this is the 2nd time. The diagnostic ( don't know the code ) but it says it's in the 4th cylinder. Thanks so much for any help!!

Asked by for the 2001 Mazda Tribute
1 answer 1 comment
what is the code number? poss po304, which would be misfire #4 cyl
What would make it misfire?,,,And would misfiring make it not pull? I had a new spark plugs put in when it happened the 1st time,,,thanks,,,I appreciate it!