My 2006 S-Type 3.0, has started sputtering shakingwhen idled. Sitting at a red light in drive, it acts like it's going to cut off. Then a Restricted Performance light came on. I took it home a parked

Restricted exhaust . Catalytic converter or muffler may be restricted .

Hello,

Do you have an engine light? Throwing a code?
Just does this at idle or when driving/acceleration?
Acting strange changing symptoms (E.G.--idle to acceleration to black smoke out exhaust, etc.)? Plenty of Gas in tank?

I am thinking: No engine light
Clog in fuel filter
intermittent fuel pump problem
A vehicle starting sensor (E.G.--Throttle Position Sensor (TPS))
Main computer
Engine Light: Pull Code
Sensor

I hope this helps.

Is your check engine light on? If it is yo can have it check to dee what code is stored. This should help lead you to the problem.

There could be many reasons, the idle air valve got stuck or is going bad, maybe a little got caught in the injector or maybe a sparkplug was acting up, i wouldnt worry unless its a problem,i know you dont want to get stuck out on the road, but this kind of problem is going to be hard to find unless it happens more often, i think it may be a idle air valve ,this would just make car stall at a light or run a little rough but you would be able to restart and go, hope this helps.

im assuming that changed the oil unit you mean sending unit ? if so could be electric short in the pick tail or worse wiring harness. second there is also possoble vacum leak .third while unit was being replaced something didnt get put back or got knocked loose. created a new problem. most times as thing are going bad they dont register until it is a prolonged problem as it took 2 days for the check engine to go out that also might have been normal. you might also notice while sitting at park when you turn the wheel you will notice ia differance in the idle, if its almost stalling then its probley your idle,needs re set, or your idle controle valve is going bad ,did it get checked or cleaned when they serviced the throttle body. and also could be your mass air flow sensor going bad or need cleaned

sounds like partially clogged fuel filter or possibly timing is off

Have you checked your fuel filter or fuel pump as these can cause your engine to to shut off, but there usually is some sort of warning, but not always.

1.Low coolant level,2. restricted rad. ( full of dirt, bugs etc.)3. Idle too low.4. Fan not cutting in.5. Water pump.

You probably purchased bad gasoline, not an uncommon problem with the gas that's going around now. Run it down to about a quarter tank and then try filling up with a higher octane rating.

My mechanic said that the front cxygen sensors needed to be replaced on my 03.