Help: Stalling with low acceleration
91 XR-7: The 5.0L runs great most of the time except on cold and/or damp mornings. I'll put her into gear after letting it warm for 5 minutes, drive down the road and it will want to cut out on me at low acceleration (especially from a stop). If I'm half throttle it normally won't do it, but slight presses to the pedal and it wants to die (i.e. RPM drops to 4-500 or quits entirely). Car is stock. All plugs/wires/cap have been changed, fuel pressure is good at the rail. I thought it might be electrical but volt gauge doesn't move. No engine light before stalling and no codes after.
I stress the low acceleration, and even if the RPM's do go up, upon letting off the throttle they'll dive back down to the 4-500 range again. When it does stall, it usually takes about 5 minutes sitting at the side of the road before it will start again.
Any thoughts that anyone has would be great since I have no idea where to go...I have fuel pressure, air and spark, everything that makes an engine go.
Oh yeah, after about 10 minutes worth of actual driving, than I trust it not to stall. Until than I'm usually either mashing on the gas to get up and go or dropping it in and out of gear which I HATE doing.