I wish I were better at giving an accurate description, but here is what I have going on.

While coasting down hills where I'm not using the throttle, there seems to be a fuel delivery issue once I'm initially back on the throttle. It's as if the car is not even running while giving it throttle then it will lurch to life after a couple/few blurps, as if it's starving for fuel. Nothing else is behaving oddly. The car drives very strong. Idles as it should, even during the episodes I've described, though I'm not at a standstill when it happens. If I'm coasting up to traffic on the highway, this does not happen. No codes are showing.

Anyone else experience this?

Could it be timing?

 

I experienced that before with my previous car, sub 3K RPM with no throttle, but that went away after installing a Wong chip.
Fast forward to the new car, and I started experiencing it again (stock chip). Just installed Wong chip, so will report back later after some more miles.

 

My '91 does this as well.

 

Funny you've said that........ I installed a Wong chip after about 2 months of ownership and am not 100% certain this condition existed prior to the Wong chip upgrade. So that the chip may have some bearing on the situation has crossed my mind too.

 

^^^^^^^
Yeah, I didn't want to definitely say the new chip fixed the problem. I hadn't noticed the issue in a long time with my previous car, then all of a sudden experienced it with the new car.
Regardless, I try to replicate the situation this weekend and see what happens...

 

 

No kidding, my floor mat is definitely riding up the bottom of the throttle pedal. Enough so that I've wondered more than once if they're the correct mats. I never would have suspected that being the issue.

I drove the 64 to work today. I'm giving your suggestion a shot very shortly.



I appreciate the replies, everyone.

 

It's a common issue and I posted on this quite a few years ago. Try swapping your DME relay. This fixed the issue on mine. And be sure to give it a proper Italian tune up after installing the new one.

 

 

BTW, I verified that the idle micro switch was not being engage with my scan tool, so I'm very confident that it was my issue. Jason, or someone else can jump in here, but my guess is that if the idle micro switch does not engage the engine may run too rich (or too lean???)?

 

 

Tested the "move the floor mat" theory and didn't have success. Going to look into the other suggestions this weekend. Attending an event tomorrow that will have plenty of downhill coasting......

Y'all have a good one.

 

If you haven't done so, you still may want to connect a scantool to verify that your idle microswitch is functioning properly.

 

The other common cause for this problem can be resolved by retracking the AFM. And one suggestion for that, is to move the PCB a millimeter vertically and not adjust the arm (like all the Porsche web guides suggest), so that tension on the resistance track remains the same.