Compression Ignition Addict
Join Date: Dec 2007
Thanked 273 Times in 262 Posts
Mentioned: 7 Post(s)
Quoted: 119 Post(s)
Feedback Score: 3 reviews
That sounds like a classic bad sensor. As it gets warmer it craps-out. If there's anyway possible you can get a good scanner on it (forget the generic OBD-II ones, they won't work) and monitor the sensors (like the IPR and ICP) I wouldn't be surprised to see one of them going bad (especially the IPR).
Take a look at them both, try unplugging the ICP (look for evidence of oil seeping through it into the connector) and make sure the IPR still has the "tin nut", that secures the coil over it, on (they will vibrate off and fall into the valley). See if the engine runs with the ICP unplugged (then the PCM will set a default value for the IPR to run on) as evidence your problem is a bad ICP.
You've been a member since 2008, so I'm assuming you know what, and where, the ICP & IPR are. If not, I'll get you a pic (IPR by the fuel bowl, low in the valley, ICP at the front of the drivers head towards the fuel bowl)