So I got a problem with my car it will shake once in awhile when the car is warm up and I am at the light but there no light that comes on or fluctuating rpm thoug......just got the tsb done for the car shaking problem couple of month ago too and they did a top engine clean for me...... any suggestion should i throw in a bottle of cleaner into the gas tank see if that help? because the dealer would not do anything since they cannot replicate the problem....

 

Take it up to 6K RPM when warmed up and drive it hard. Seems one of the approaches to keeping the carbon off is to run it relatively harder than day-to-day driving.

 

putting anything in the fuel won't help- the part that gets the buildup isn't touched by fuel on the 250... (which is why the 350 doesn't have this problem)

That said there's supposedly a new TSB for the carbon issue that isn't a top engine clean, it's nearly an engine rebuild (new pistons/rings at least)

 

+1 on this. Do this one once in a while, no need to do it everyday, but a couple times a week let the car rev up past 5-6k RPM and drive it hard for a bit. Babying the car all the time will only allow the build up to increase.

 

i see because it take me like 10 min to get to work .from home it take me 5 to get to highway and then another 5 min on the highway

 

Off topic, but I'm pretty jealous of that commute time. It takes me 1.5 hours in LA traffic to get to/back from work every day.