Aprillia Pagaso efi stutter at 2 to 3000 rp. This causes jerky throttle response especially around town and I think adds to the high fuel usage.

Check spark, magneto or generator, and air filter - at higher speeds you will need stonger spark and air flow

throttle position sensor bad ? map sensor equipped ? not sure on that model but be my starting point. not sure if adjustable idle ? efi . does all that i think. read owners manual and see if they use injector cleaner of any kind. pressure regulator can cause this too. wish i could help you more. i need go back to school on that one. sorry please let me know what you find thanks

Your TPS switch is on one side of the butterfly plate in the air induction system. Disconnect the connector to this part and hook an Ohmmeter to the TPS unit.

Then open and close the throttle by hand and observe the Ohmmeter action. It should be smooth to the throttle response. If it lapses and jumps, the TPS is bad.

Update the video codecs for the video editors you use on your computer.

if only problematic at that speed, the only thing i could think of would be the electronic ignition module.

Try setting the Roomba on the floor, powering it up, pressing down hard on the front, just above the front wheel, and hitting "clean" or "spot." My Roomba had the same problem, and this seems to do the trick for it. I think it has something to do with the Roomba thinking the front wheel is extended (which would indicate a cliff) even though it's really not.

If this doesn't work, you might try pressing down over whichever wheel doesn't turn when you turn the Roomba on.

the fuel is lean on the bottom, i dont know if the power commander can add some fuel or not. Why disconnect air injection, also if disconnected is the exhaust leaking.

You changed the back pressure in the exhaust and that is what causing your problem either put the washer back in or have the carb properly jetted

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Most common cause of stalling for Lincolns in that era is the TPS (Throttle Position Sensor). It regulates fuel mixture, idle speed etc. A bad TPS will usually act up in one of two ways:

1. When cold, car continually stalls
2. When warm, car stalls when slowing down (especially if AC is on)

As far as valve cover oil leak, it's a problem that should be addressed to keep oil from fouling your spark plugs but highly unlikely to be the cause of your stalling problem. Hope this answers your question. All the best.
Greg

Your lens may need adjusting. This info may help . Other People solved problem. Lots of Info on this link.

http://www.fixya.com/support/t102982-e_18_problem