1999 996 C4 Poor idle, then no start issue

[jaekormtb]

Hello all,

The car is a 1999 996 C4 MT with 206,000 miles. When the car is cold, it starts fine and idles well. Once it is warmed up, the idle becomes rough and eventually the engine stops running unless I give it a bit of gas. Then I get a no-start issue. If I hold the accelerator to the floor, that gets the engine started again. 

I am getting a CEL: 1341, bank 1 

I do have the Durametric tool, but am unsure what to do to measure the camshaft deviation and to activate the variocam. 

What are everyone's thoughts??

 

To add: I have cleaned the TB and all done all of the basics regarding poor idle, but no change. At 125,000 miles I had the engine out to repair a cracked head (Hoffman did the repair) at the time I replaced valve springs, reground the valves, and replaced all of the chain ramps and variocam pads with updated parts.  

Edited Wednesday at 09:57 AM by jaekormtb

[JFP in PA]

To measure cam deviation with the Durametric system, connect the tool and navigate to actual values tab and select cam deviation Bank 1 and 2 to view the values.  Ideally, the engine should be fully warmed up to get true numbers.

 

The video below shows someone doing the same thing on Boxster, but the process is the same: