if it's not the right kind, then YES. I'm pretty sure a 87 Bird takes 10W30
yes
It could be a cracked Rotor Cap, or bad ignition wires
May be a bad fuel pressure regulator.
Bad Blend door in heating system
Ford recommends the use of 5w20. In fact, they push 5w20 for all the Modular V8's, and even back dated the older Modulars to use 5W20. They tested the 5W20 Motorcraft oil enough to recommend useage for all the Modulars. That being said, if you have cold winters run 5W20 or 5W30. Because of the engines tighter tolerances, and the OHC design, a thinner oil cold will be a better choice so it flows to the upper cylinder heads quicker. If you live in a hot climate, 10W30 wouldn't be a bad choice, but the 4.6L was designed to use 5W30/5W20. I run 10W30 in the summer, 5W30 in the winter. Hope this helps.
they could have burned out, or the wires are bad. I recommend getting it checked by a mechanic ;)
Have you checked the fuse panel under the dashboard for the instrumentation fuse being good or bad?
Bad spark plug?Bad plug wire?Bad valve?Bad piston? If plug or wire not defective do a compression check to determine whether problem is internal
bad fuel pump bad fuel pump
it could be either your wheel bearing or rack and pinion going bad
Most likely it is a bad thermostat. The switch on the radiator fan could also have failed.
Bad ground Bad switch in steering column