Flat spots come from fuel /air ratio problems and the Stromberg carby on the 2002 has a plunger accelerator pump that has a setting so that a steady stream of fuel is injected into the throat of the carby when accelerating. Check that the plunger is working all the way down and that the 2 ball valves in the pump are working and not held open with rubbish. Look down the throat and press down on the accelerator lever and you should see a steady squirt for the full throttle movement
SOURCE: throttle body in 2001 Passat
throttle body is located at intake manifold ..follow snorkle from air cleaner to where it attaches to motor ..looses hose and clean with carb cleaner there..open blades(throttle) to get behind entry good also..... fuel filter is located in tank and in line from fuel tank just in front of tank inline with fuel line...good luck
SOURCE: Electronic Throttle Control
The ETC is located inline with the air intake hose. Take the air intake hose off, then take the ETC off. Go to advanced auto or autozone and get carb cleaner or throttle body cleaner. Give the ETC a good bath and put it back on that should fix the problem and save you $600 or more in repair. This is a typical problem with the ETC when you start to get high miles. Hope this helps it help me.
SOURCE: Acceleration Issues - Fuel Injection Problem?
A pressure test needs to be done to determine if the right amount of fuel is being delievered. Another thing that can happen is the TPS can be out of range, or even bad.
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