[loss of spark]

I need help. My 1983 Maxim 400, start up nice. But when I give her the gas I loss spark on righr side.Changed coils. Changed pick up coils. Still the same. Loss of spark on right side plug, when I try to increse RPM. Spark comes back when let off the gas, and rpm's drop to idle.

Paul

[Posting in wanted section]

I a new member. I live in the USA. How much money is F5??? Is that pounds???? In England money. How much in US dollars???

Paul. I need parts