89 Lincoln, I'm pretty sure it's the same block, and the problem was dirty injectors. They're fucking expensive for that engine, so try cleaning them thoroughly.
Reading through the post again, the first thing I'd do is a compression check.
If you have the code reader, do a cylinder balance check. I assume you know how to do it, but I'll go through the procedure anyway incase anyone else is wondering. First, do a KOER check, wait ten seconds after the last code is sent, press the accelerator 1/4 of the way down and immediately release it. Code 9 will be sent if everything is OK, any code from 1 to 8 indicates that the corresponding cylinder is not firing properly. If any code other than 9 is sent, perform the test again. If any cylinders fail that check, do it a third time.
If a cylinder fails once, you probably have a slightly dirty injector, worn rings, etc. If it fails twice, same problems but more severe. If it fails all three tests, there's either a fully clogged injector, a short in the ignition system, or completely blown out rings.
Side note: If anyone has a Ford EEC-IV or MCU code reader and needs to know how to do any engine tests, PM me and I'll get back to you with the proper procedures.
Quote:
Originally posted by tfpfreak
Dont know if the motor is set up the same, but my 98 f150 did the same thing. Nothing showed on the scanner, but come to find out it was one of the coil pack to the spark plug. Just my two cents!
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I'm pretty sure they had switched to the more reliable 289 block by then.