iam just running pump gas. no additives. aslo when it get hot there is a little skip in the motor... when the motor cools off i can start it back up then its fine up till it gets some temp in the motor. could this be lack of spark like do i need to run a msd box? i just have never seen plugs that turn blue/purple it just seen to me that its getting too hot or something. and thank for all the help so far reps for the help