York 210 runs to a two and a half gallon tank mounted where the spare tire used to be. Airlines run through the chassis rails to a high pressure cut off switch, regulator and coalescing filter mounted in the second battery tray along with a...
Check the gas tank and brackets.
I read a post a while back about a guy with the same issue.
The post said something about the brackets being lose and when the gas rushes forward when slowing or stopping the tank shifted, then settled back once...