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I am working on a 1989 Ford Ranger 2.9 liter. It is surging at idle and lacking power. I cannot find a vacuum leak. Catalytic converter is not pluged and I have replaced spark plugs, cap and rotor. It has proper fuel pressure. The engine light is on and my "red brick" (snap on scanner) is not able to communicate with it. This one is just throwing me for a loop and maybe someone will suggest something that I have not tried.
Thanks a bunch.

Covergirl  

Check the turn signal fluid
 

torquewrench wrote:

Check the turn signal fluid

You didn't mention replacing an oxygen sensor in your list.

My son has the same '89 and we just had this same problem with his. It would idle real high and then almost idle so low that it would just about stall..

It was the PCV valve..  

check vac leak with long hose  or try eather /and if i have to tell u what to do with these then u cant do it  

im working on a pontiac grand prix that has the same prob.. it was running for a little while but poor and then it would stall.. the spark pluggs fowld.. red brick showed nothing for one of the o2 sensors i replaced that it was bad.. seems to continue to run now for a while but then stalls after awhile vaccum is good and fuel pressure is what its sposed to be at.. if you make a fix let me know.. and i did a turn signal fluid flush in mine maybe you should do that lol  

I didn't get  a chance to check the forum before I went to work. Thank you for replying to my post. It ended up being a ground wire to the Oxygen Sensor. All is good now. Thanks.

Covergirl