[racingdwarf]

If the engine has run to lean or by some means sucked some dirt in the P&L can be dammaged very easly in minutes, also how much use has the truck had in three months? Stan crompton once told me how long a race tuned P&L would last in 1/8th buggy........I can't remember now but it was not very long. You can get them pinched now.

But as sombody has said, if you can get someone who knows what they are doing to have a look...Engine tuning is a dark art that takes years to get right