for the hard starting problem when it cranks but doesn't want to run, Marks have a tendency to need the crank sensor replaced or possibly just removing and reinstalling the connector (after cleaning it up)-facing the engine from the front of the car, it is at the 7 o'clock position of the crankshaft pulley, next to the air conditioning compressor. If you replace it, you need to jack up the right (passenger) side (don't forget to shut off the air ride switch), loosen the serpentine accessory belt, loosen (don't have to remove) 3-10mm bolts that hold the ac compressor to the engine and remove the 8mm bolt (easier done from up top IMO) that holds the crank sensor to the block. A new sensor is about $25 and it is a 30 to 45 minute job, I have owned a couple of marks and found that it solves stalling or erratic starting problems on both. Hope this helps.