help with shudder on 2008 focus SES
i am looking for help with a problem on my automatic 2008 focus SES (~125K). when driving 80 - 90 kph and accelerating gently out of a corner or up a hill a significant shudder occurs occasionally from the front end. ive never had the shudder happen when im applying a significant amount of gas, like when passing. the shudder lasts ~1 sec, and either goes away on its own or when i release the gas pedal. when i try more gas during the shudder it usually gets worse and goes away when i release the gas. when ive been able to take my eyes off the road ive seen the tach either stuck at ~2000 rpm or very slowly increasing, and jump to ~3000 rpm when the shudder ends on its own. also, the TCS light by the tach starts flashing during the shudder. ive tried turning off the TCS, but the shudder still happens. the TCS light flashing seems significant to me, but i havent been able to find this symptom, or the problem in general, on the inet. the dealership couldnt reproduce the problem, so they couldnt do anything about it.
any suggestion would be appreciated, even if it just pointed to where i could ask the dealership to look at.