Rough starts and slow acceleration

Asked by Jun 05, 2014 at 10:18 AM about the 2005 Volkswagen Jetta GLI

Question type: Maintenance & Repair

I've been having a few problems with
my mk4 jetta. Lately after the car hasn't
been started for 8 or more hours it
starts really rough and dies unless I rev
it while it evens out. Then it idles and
starts fine after that. The second
problem I'm having is with acceleration
from 40mph or so and beyond it
seems. I can put the peddle all the way
to the floor and it will accelerate 1
mph for every second, then all of a
sudden the power will come back the
next time I drive it. It isn't throwing any
error codes and there hasn't been any
CEL light on from the rough starts. I'm
stumped. Any idea on what it could
be? Thanks!

2 Answers


It sounds like you have got a mass air flow sensor bad, or a throttle positon sensor that has gone bad.

Alright I think you are on to something with the TPS. When I'm in 5th gear and floor it the scanner says the throttle percentage is only at 29- 30%.

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