Dude, I tried everything! I used to use the name of vicfett, but forgot my password. At any rate, I feel for you big time! Why? Because I tried absolutely everything. I don't have alot of money, So i couldn't take it to a shop to have it fixed. I was too afraid that they would say it was a million things and charge me for them, when in actuality, It would most likely be something costing about 2 bucks! I tried small things first, Then moved up to more costly things. Of course, I asked a million questions and got the same reply...They all were dead wrong!
If I had a gallon of gas and a match, I would have put it to rest where ever it broke down. I got extremely tired of racking my brains trying to figure out the problem. I checked every wire known to man. I have come to this one conclusion... "It's an electronic problem which may rest anywhere, yet no where to be found or seen. With as many sensors the vehicle has, There are atleast 2 pounds of wire and twice as many connections to check that could be faulty.
So, after of pondering about this. I gave up and used it as a trade-in towards my new blazer. The total? $500.00 US dollars.
Contacts get worn, dirty and sometimes look as though they are making contact, when in actuality, they're not. Inside the computer, anything can happen. My blazer would have reached 200,000 miles, But because of this bug, she came up 7 miles short.
4.3 liter Motor: Heart
Drive Train: Muscle
System computer and other electronic sensors and wiring: Nervous System.
Nervous system failure.
Sorry dude, I really wish that I could help. But I have spent many hours which stretched into weeks reading, buying, searching, cleaning, asking, buying and buying more. All to no avail.
Trade her in and move on.
I tried everything that message board readers told me to try. Nothing worked.
Codes said that everything was ok. I learned to read the codes myself, then I would take the blazer out until it would occur, read the codes, Codes read that everything was fine.
The other thing that I never did try was this, Take out every inch of wiring and replace them. Clean every electrical contact on the vehicle. Take out and replace the computer and every sensor. After spending $350.00 on parts, I wasn't about to spend 5 times that, plus quit my job and spend the time to do so. I already almost lost my job because of this problem. I really couldn't take any more risks with my job.
I hated to see my old '88 blazer go, But I had no choice. Now I own a '98.
For everybody who owns a blazer, After 150,000 miles, be prepared to set some money away. Thats when everything started with mine.
On this newer blazer, I will change out all relays about every 15,000 miles. I'm not waiting around until they fail!