[monkeyodeath]

Well, I'm thoroughly stumped by this one.

Thinking that I might have just gotten a bad tank of gas, I took a drive tonight. The car had trouble idling at first and there were some hard shudders, with the engine cutting out. But once I got onto the freeway everything seemed fine. Engine pulled like normal.

Then, as the car warmed up, I noticed the occasional hesitation. Very brief shudders while cruising along at 70 in 5th gear.

So, to summarize:

- Hesitates badly at cold start, shuddering and dying at idle. Applying throttle helps keep it going through the shudders.
- Idle speed is fine when it's stable.
- Hesitation is like a total engine thing, not a single misfire.
- When driving at low speeds while engine is cold -- hard hesitations until up around 3k RPM.
- Runs fine at freeway speeds but slight hesitations once warmed up. Seemed to happen most cruising along at 70 in 5th.
- Once I got home, the warmed-up car idled much better, no hesitation or dying.
- Doesn't seem related to physical position of car (bumps, turns, up or downhill)


Replaced:
- Plug Wires
- Cap/Rotor
- FPR
- Reference/Flywheel sensors
- CHT
- DME Relay
- Smoke tested for intake leaks
- Idle switch tests OK
- Fuel Pressure tests OK (haven't done volume test)

Any place else I should look? This feels like an engine-wide failure -- not just a single cylinder misfiring. Wondering if the fuel pump is on its way out, or it's something with the coil or DME. I just hate throwing parts and $$ at the car. Maybe I just need to run through this tank of gas?