Hesitation under load

[Wyattman2015]

Hello Wyatt-

Start with a timing light. Check your iginition timing, that is often the culprit with hesitation. Second, with the truck running, spray some starter fluid or brake cleaner around all the vacuum areas and see if you get an rpm change-you should be able to hear it. If so, you have a vacuum leak, another frequent hesitation culprit.

Finallly, you will probably get more responses, perhaps from people smarter than me, if you start your own thread.

Good luck!

Chuck

Thank you, much appreciated Chuck

 

[Wyattman2015]

How about some more information too.
Or you can wait till you start your own thread and include information.
Such as, what other things have been done to the Bronco that you know of?
And is this Bronco new to you? Or have you owned it for a long time?
When was the last time it was given a full tuneup? A bad PCV valve can cause this as well, as can points that are out of adjustment or deteriorating.
Your original 71 distributor would’ve had points and condenser, however an original one could’ve been converted using one of the three or four available electronic conversion kits at the time.
These days Pertonix is the main go to, although in the old days there was Accel, Mallory, and a couple of names I am forgetting at the moment.

Absolutely check for vacuum leaks as was previously described. This is a critical first step I think.

And as usual, pictures would come in immensely handy.
To post them directly here, you have to become a contributor for 12 bucks a year. Or you can use a free hosting site elsewhere, and link the pictures to your post.
Or you can also upload them to your garage or gallery up above.

Thanks for the advise and will become a contributor shortly.
Much appreciated.

 

[kat]

Old school trick, poor about a half quart of transmission fluid in full tank of gas. Breaks up carbon and 'lubes' things up. Had a "not as crisp thottle' as it used to have and remembered my dad used to do this about twice a year to his old trucks.

Never mind, looks like you found your problem. BUT, this does work.