I am been worrying about my "engine shaking while launching" problem for year. First I thought it was my engine and tranny mount so I replace them. But the engine still shake. Last week when I tried to replace my spark plug I accidently broke one my cable. Then I replace the whole set of wire with NGK. After that, I am now able to launch with no problem. I think the shaking was cause by weak spark or misfire. anyway I am happy now.