in my case it was a coolant sensor next to the waterneck on the intake
Iam not real sure about this but on a 89 the filter was along the frame on the rightside if im not mistaken. It should just ofter the truck bed starts from the cab going toward the back. Hope this helps and that i was right.
1988
High Spirits (1988)
Do Right by Me was created in 1988.
Portrait of a Family - 1988 Going It Alone 1-8 was released on: USA: 1988
Right Attitude - 1988 is rated/received certificates of: Australia:G
The cast of Going Down - 1988 includes: Floros Floridis Evri Sophroniadou
i was told the alternator was going bad and somehow it was backing up into the speedometer
14 Going on 30 - 1988 TV is rated/received certificates of: Australia:G Iceland:L
it sounds to me it needs a map sensor
Starts and stops the fuel pump.
You could have a balljoint that is going bad or possibly a strut mount too.