86 bronco 2 6.9 v6

[lostempire13]

Hi i need some help were stuck.
Replaced: Distributor cap
TFI
Spark plugs & wires
TPS sensor & connector
Fuel Injectors
Fuel pump
Fuel filter
Crankshaft hose and thing that goes in as well as breather
Battery
ICM
Map sensor and connector
FPR
O2 sensor

We have also changed oil done seafoam treatment in gas and oil as well as Lucas oil after the oil change, we've checked fuses wires etc and it still is hard idling, now under load, rpms fluctuate and there is a misfire. We checked the spark plugs again and the 6th had black ash so we got a new one and put a no foul stopper all the others are fine. PLEASE HELP!

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[DankTank]

Check your compression. Low compression can cause an engine to misfire and just generally run like poo.

You've pretty much covered everything else.

EDIT: Maybe it's leaking too much vacuum. Low vacuum can screw with the air/fuel mixture.

 

[RonD]

Welcome to TRS

Holy Smokes, reads like you started from the outside and are working your way in, lol.

Yes, spend the $20 for a vacuum gauge and test engine, read here on tests to do: http://www.gregsengine.com/using-a-vacuum-gauge.html

An engine is an air pump, self powered, but still just an air pump so testing its pressure is best place to start, vacuum and/or compression test is best place to start.

 

[btmayfield87]

Haha yes pretty much. Right now we are working on the timing and got it but we accidentally had the BOLT on the back of the distributor come out and just finally got it back in we will finish it tonight.

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[btmayfield87]

Oh and when we had it started with it in the correct spot it sounded great so God willing the timing will fix it.

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