Rough Running 88

Does the engine move from side to side when the throttle is blipped? if not, the motor mounts may be shot which has the engine rest on the crossmember and transmit all sorts of unwanted vibes.

Strg wheel vibration are perhaps strg components, wheel brgs and/or brake rotors.

Okay,
1)Let's rule out the MAF for now.
2) I'll assume that your distributor cap is seated properly and the screws holding it are tight. Please, please, please check your plug wires. Make sure they go to the proper cylinder. For whatever reason, when I have replaced plug wires, I seem to want to cross #5 and #6 ...or #6 and #7. I dunno why, but the car runs much better when the plug wires go to the right place.
3) Coil amps. I suppose you are talking about the secondary ignition amps in the front under the plastic cover? If one was bad, the car would run on only 4 cylinders. You would need to know what 4 cylinders it was running on so when you swapped the amps, you could check to see if it was running on the other 4. But that is possible.
4) If you have insuffiecient fuel pressure, that could cause the symptoms you describe. We'll have to wait for your pressure test to let us know if this is, in fact, part of the problem.
5)The injectors probably do need to be cleaned. They could be gummed up enough that the car will idle but starve for fuel beyond that.
6)Temp 2 sensor can cause all kinds of funky running issues. It communicates with both the LH and EZK, is easy to replace and relatively cheap. Replace it. The Hall sensor fault will retard timing and reduce power, but beyond that, I don't think it will cause the symptoms you describe. The O2 sensor can cause some crazy running issues also. You can unplug the O2 sensor and disconnect your battery for a short time to reset the computers. The computers will reset and look for the O2. When it doesn't find one, it will increase the fuel to the cylinders by a certain amount, but the car will run fine with that additional amount.

And...check your grounds for the injection harness at the back of the engine on either side of the "V" and your coil grounds.

Just to add to John's suggestions.. Get a vacuum gauge and verify that you have a good vacuum.

Great stuff!

Plug wires to plug: did it twice with supervision. Correct.

Replaced motor mounts: same symptoms

New O2 sensor enroute.

Problem became what it is now after running the diagnostic program. Car went from a little rough to un-driveable.

EZK replaced with unknown quality EZK (used or refurbished?) don't know which. That was 2001 Vertex Miami. Been working OK for 12 years. Thinking about having it looked at along with LH.

Will check grounds.

Did vacuum check. Surprisingly holds quite well.

Firm user of Techron, and with storage.

Heading for FL for winter. May not get back to car until spring. Thank you all for your help. Will advise.

Something else to consider.. Check your temp II sensor and its connection. The MAF and temp II plugs can be common fault points. It's good that you verified that the MAF plug is in good condition.

Slave01;12386 wrote: Heading for FL for winter. May not get back to car until spring. Thank you all for your help. Will advise.

You should have one waiting for you in FL! That would be a GREAT place to drive a 928 in the winter time!!!! Its not like they are all that expensive either! Just gotta find the right one! Some great Regional Reps in FL too!!!