Flashing CEL, misfires, and no idle

[viper501]

My CEL has been on for a few days but has historically been a MAF issue that comes and goes. I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months. However, the constant state CEL returned and then left and returned again recently.

While cruising at about 75mph and about 3 hours into my trip, the car hiccups and the CEL starts flashing. Engine feels rough, almost as if I was running over bad pavement. Got off of the interstate at the next exit and the car cuts off as soon as the RPM's drop. Fortunately was able to get to a gas station and do some inspection. No fluids from the bottom of the engine. The coolant levels appear OK and the oil level and color is perfect. I suspected the MAF so I pulled the plug to force the car into limp mode so I could find a NAPA. Car would not start at first but finally did and ran but needed to be coaxed to run. Would not idle at all. Very rough running.

Nursed her to an Advance auto to get the codes read and came up with a MAF code ( as expected esp, after unplugging it), multiple misfires, add'l codes for misfires on cylinders 1, 2, and 3, and an evap canister purge valve misfire code. Cleared the codes, plugged the MAF back in, and restarted to see what she'd do. Started but would not hold idle again. Clearly misfiring. Pulled the codes and the MAF was gone but the evap code remained and it was showing several misfires.

Nursed her to the Porsche dealer, such as it is here, and left her for diagnosis tomorrow. :censored:

Car is a 99 c2 with regular service. Plugs were changed about 10k miles ago and the coil packs were inspected. Did not find any indication of cracking or other failure. Alternator was replaced around the same time frame due to catastophic failure. Car is a daily driver and has a little over 126,000 miles.

Any ideas or suggestons?