after driving my 245 turbo ic, i noticed that the exaust manifold was glowing red . is this normal? i have had it hapen on my 140 when there was a vacume leak so it was running lean. the 245 has had a loss of power latley . i've replaced all the hoses that i found were leaking and still no improvment exept a smoother idle. i checked the plugs they look fine. what else should i look at? thaks for the help.