Hi everybody who helped out, for my own curiousity, I test drove a 300E (103 engine)with very low mileage(38000 km) yesterday. I did felt some power difference, may be that where the lower compression (150 +/- 5 psi) comes into play. May be oil is fouling the plugs as well. I guess there is no quick fix short of tearing down the engine if I want 177 HP back, Right