HOW DO I GET RID OF THE CARBON BUILDUP IN MY ENGINE AND GET IT BACK TO RUNNING SMOOTHLY IT FEELS VERY HEAVY AND SEEMS AS IF ITS LOST SOME POWER.

Sounds like worn piston oil/compression rings and/or cylinder walls allowing oil blow-past under heavy load. If that is the case, the only solution is an engine rebuild. If the engine is in good shape, it is also possible your engine has carbon buildup which is breaking loose and combusting. You could try to clean out any carbon deposits with an oil change and a good engine oil additive, and a good fuel system cleaner to clean the engine and see if that helps.

Could be what is called "dieseling" where it sounds like a diesel truck.
Possible causes are a heavy carbon buildup in the cylinders, or the idle speed could be too high.

I assume that you mean it runs after shutting off the ignition system. This is sometimes caused by carbon buildup on the piston tops. The carbon is hot enough to ignite the fuel and keep the engine running.

To clear the carbon, try driving in a lower gear to get the engine to blast off the carbon by increasing the rpms. Carbon buildup is caused by short drives, slow driving.

Sell your Tiguan. I had the intake clean done last Nov for the 3rd time. Last week in the fast lane car lost power and I was nearly killed. Today the VW tech tells me its carbon buildup again. I am dumping the Tiguan and going back to Japan again. PS I always use "Premium" why I dont know.

P1406 EGR Valve Pintle Position Circuit Fault
This code is usually caused by carbon buildup in the EGR valve. The carbon deposits prevent the valve from closing completely.

After removing the EGR valve, clean the pintle seat area of the valve and the corresponding passageway in the engine.

or simply replace the EGR valve.

The purpose of you EGR Valve is to recycle un-burned fuel back into the engine, not only improving fuel economy by reducing the engines pumping losses, the EGR increases the mass in the intake; more mass means higher pressure, or less vacuum. Now the piston has less resistance during each intake stroke, which results in better gas mileage.

So if your EGR Valve is clogged, damaged or simply just not working - the those rich un-recycled fuels will make your car burn richer. (Which will make you burn more fuel.)

Hope this helps!

replace both and also check for a loose ecm ground

if it seems to be stumbling when you turn it off but keeps running then you likely have carbon buildup on the valves, pistons or plugs .. the carbon stays hot and keeps the engine running even without spark .. usually if you hit the gas once it cools the hot carbon and the engine quits .. i suspect your f150 is never run fast .. a romp in passing/second gear once in a while usually keeps it clean .. there is special cleaner you can run thru to clean out the carbon .. you can get that an any auto parts store .. make sure the plugs are the correct heat range .. plugs that are designed for oil burning engines stay cleaner but may be too hot .. that can cause the same problem ..

now if your engine runs on smoothly with the key off then i would suspect a problem with the ignition switch or wiring

Your power steering engine/ pully has gone bad. needs a replacement then.

Take care and do fix it on time before you get the steering rack damaged.

Good luck.

rate this please

Try replacing the ignition control module it is located under the distributor cap Cost is around $30.

bad rod bearings time for a new engine