Fuel pump, injectors maybe. Other less likely suspects are the coolant temp sensor (does the 87 have this?), catalytic convertor, or the O2 sensor. All can cause rough/irregular running/acceleration.

I'd check the fuel pressure, and also pull the injectors to clean/test them. Even if this doesn't solve the problem, you can at least check them off your list. And you'll have a better running truck when you do fix the problem. Best of luck! <img src="/forums/images/graemlins/kewl.gif" alt="" />

Sean - Orange County, CA
MAIL: seanwilliams78@gmail.com
1995 Montero SR - For exploring and getting away!
1994 Volvo 850 Turbo - 402hp and counting!
1966 VW Bug 2275cc - For stoplight drags!