Misfire when hot

My 1993 940 Turbo with 15g, IPD cam, and TLAO chips runs fine the whole way through the range when the engine is relatively cold. However once it reaches full operating temperature it misfires at any boost level above 7psi. I have no idea why. It just started doing this within the last 300 miles. Any suggestions?

Have you checked for boost leaks?

No boost leaks. I ended up throwing a set of plugs at it because I happened to have some. It seems to have helped.