i experienced this before...
before this hapen to me, i sent my car for a major service+top ovehaul
after i collect mycar, it was very slow in pickup...at trafic light, even a 660 SLK can tapau me easily...
then i took my car to mspeed and found that my cam shaft was position/timing wrongly...
after he adjust the cam position back according to the tool he had, everything back to normal....
i dono how the camshaft position can run like that,hehe...ask my mech who did the service, he said he didnt touch on that at all...:dontknow: