Catalytic converter could be clogged up.
Regardless of age, battery discharging first needs to be addressed and fixed - bad battery or something in car (like a light) may be staying on when car is shut off.
Fuel pressure is too low - should be around 50psi and may be caused by an intermittent fuel pump or regulator problem.
The cause of the other problems is usually with the IAC or MAF sensors or the EGR valve - fouling at the EGR, IAC and/or throttle body is to be expected for a car this old.
SOURCE: car hesitates on take off,poor
1994 Pontiac Grand AM . Starts fine. Has no power going down the road.
SOURCE: P0171 Code (Lean Fuel Bank 1) Engine light on
you nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak
SOURCE: 2007 Lincoln MKZ, very intermittent transmission hesitation
This is going to be either a programing issue in the transmission control module or an main control valve body concern. This vehicle is under warranty for 48 months or 50000 miles so I would have my local dealer take a look at it.
Ford has a new techincal service bulletin out on a concern similar to what you are describing. It states that if vehicle has less then 20000 miles to reprogram the PCM and TCM, if it has over 20000 miles they recommend to replace the main conrol valve body. The TSB number is 08-24-01
SOURCE: 1991 lesabre wont start after shutting down. If it
Best to do a fuel pressure test, pump might be weak and dosent show up until it gets gets warm. Best to do the test after it quits again when pump is at its hottest. If you havent done it yet chg. fuel filter too.
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Figured out problem. Take note because this was a strange one that was not easy to find. Problem was poor ground from rusted coil pack screws. If you look at the coil pack, the left side where they screw down has metal, which grounds them to the ignition module; the right side is just plastic. The screws had star washers attached and there was so much rust between the screw head and washer that poor ground was being achieved. That?s why changing the coil packs out made no improvement. I was using the same screws. I cut the old star washers off the screw heads, put new ones on and coated them with conductive grease. Problem was gone instantly and car runs smoother and has more power than ever before. While I was at it I ran new #4 ground wire from engine to frame and from frame to battery negative. Moral of this story is CHECK YOUR GROUNDS if you have intermittent problems that are hard to pin down.
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