have you looked at the error codes? they are found on the diagnostics page of tuneECU. anything that happens that should not would be listed, but not necessarily show a 'check engine' light on the speedo.

you can test with the engine running

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter