87 Bronco 5.8 missing backfires

[bronco junky]

Running fine then starts missing badly then backfires then acts like running out of gas ...idels fine until put n gear then falls on face..any ideas

 

[miesk5]

Yo bronco ******

Welcome!

Check for vacuum leaks, see my diagnosis @ http://broncozone.com/topic/23994-90-58l-getting-continuous-code-33-and-running-code-44/?p=125535

Post #20

Have plug wires been replaced just before this happened?

Air filter, is it relatively clean?

Air inlet atop radiator support to filter box and to throttle body; look for obstruction; damaged tubing

Fuel quality, did you buy gas before this happened?

Oxidized fuel often turns darker over time and may even smell sour. You can check gasoline by pouring some into a clear glass container and comparing it side-by-side with known fresh gasoline. If your old sample looks noticeably darker than the fresh gas, you have strong evidence the gas has gone bad.

Top Tier Gasoline, see http://www.toptiergas.com/why/

Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19

@ http://broncozone.com/topic/14269-code-reader/?pid=74587&mode=threaded

Some basics;

The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test.

If you can, run it around to heat the engine up and shift thru all gears including Reverse.

Make sure A/C is off and transmission is in Park (automatic); or in Neutral for a Manual & release clutch.

Then turn off engine, all accessories/lights (close driver's door) , etc.

Do KOEO test First

Post Code(s) here according to:

KOEO

&

KOER

 

[bronco junky]

Thanks bro I'm fixin to tear it all out down to bear bones n replace it all.its gonna cost me but I figure it will be worth it n long run.plus it will probably keep me from burning to ground