my engine stutters/chokes when pulling off from traffic. i notice it happens usually when i ease off the gas in 1st gear and accelerate again. wondering if it's incorrect air/fuel ratio or other technical problem.

pls advise. thx

 

We'd need more info than "It stutters". Is your car manual or stick? How much gas are you giving it (Assuming it's a stick)? What kind of car do you have, MCS or JustaCooper? R53 or R56? What mods do you have done to the car?

 

I wonder if it only stutters on t's, s's, and d's.

 

Or in some gears it stammers...

 

more info is needed...

 

Hi, it's a manual 03 cooper S. am using 19% pulley, ECU reset, fast cam, coil, header and exhaust.

thx

 

I vote coil, buy the stock coil or put yours back on. What kind of cam is it (Not familiar with "Fast Cam)"? And what is an "ECU Reset"?

If you have a tune, knowing what kind of tune it is will help. If you have a unichip, that's likely part of the problem. Your cam if it's a custom ground cam could potentially be causing issues.

The more info we have the better the chance of us getting the diagnosis correct .

 

Mine is rendered speechless on occasion as I continue to ease back into manual-shift driving. How embarrassing!

 

let me list more upgrate: ignition coil, remap ECU by TMS (german), cylinder head valve, larger intercooler, performance camshaft (think 260 degree), SPEC clutch, flywheel, final drive, intake kit.

i did these upgrate a yr ago. dun remember the exact brand.