Start by finding the leak using a smoke tester Repair it and clear the codes See what, if anything, comes back Fuel sensor code is something unrelated to a vacuum leak. Well your vacuum pump seals are probably leaking which will cause misfire If that's leaking i bet you have various other oil leaks
There's probably other stuff going on that more directly causes misfire Take to a vw shop, bring about $3500 bc that engine is coming out. Scanner showed several misfires on cylinder 1 and one or two misfires on cylinder 3 which coincided with the stumble Ran fine after turning the car off and restarting Coil packs are 3 month old boschs and plugs are same age ngk laser platinums Pcv and breather are new
A vacuum leak would genearly affect all cylinders equally An acception would be a bad fuel injector seal This could cause a more localized issue, to affect that cylinder more than others. You can mostly eliminate vacuum leaks as a cause of the problem by using a can of carb cleaner With the engine running lightly spray around the intake manifold and vacuum lines (avoid the plug wires and the coil) If you actually have a vacuum leak, the engine will speed up when you spray the spot that's leaking.
Vacuum leak can cause stalling, rough idle, trigger engine codes such as lean codes and misfire codes, it cause hard start or no start, high idle or low idle and so on. Identifying vacuum leaks • vacuum leak misfires • learn how vacuum leaks can cause misfires in your engine and how to identify and fix them. A single cylinder misfire can cause a plethora of problems in a vehicle, including decreased fuel economy, increased emissions, and engine damage One common cause of a single cylinder misfire is a vacuum leak. An evap leak can potentially cause a misfire in your vehicle A vacuum leak can indeed cause a code to be thrown in your vehicle's engine control unit
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