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  1. S

    ISO. Main and 2nd Jets 75 2f.

    Btw good advice to check plugs and go from there. And big jets can mask vacuum leak. Thank you
  2. S

    ISO. Main and 2nd Jets 75 2f.

    I am pulling 20-21psi at idle. Not sure of idle rpm but it is pretty low
  3. S

    ISO. Main and 2nd Jets 75 2f.

    Thank you. It's interesting that most other threads talk about much smaller jets. I have a 159 in the main now and it seems to be strong. I will try leaner as a test later.
  4. S

    ISO. Main and 2nd Jets 75 2f.

    That's interesting. All the charts show main jet max is 140. And that's only in 75. The other years were shipped with 136 amd even lower. I ran the 159 that was in my secondary and put it in the main. Truck runs pretty good so far although now I will drill the secondary to 220. You say you are...
  5. S

    ISO. Main and 2nd Jets 75 2f.

    Thank you. Did you run the 147.5 and 220 combo? Is that working for you and I am guessing you are near sea level.
  6. S

    ISO. Main and 2nd Jets 75 2f.

    Here are some picts to add for this thread.
  7. S

    ISO. Main and 2nd Jets 75 2f.

    I have a 75 FJ40 with 2F. Couldn't figure out why ran so bad and needed choke. Well, I am at sea level and it had high altitude jets in it (103/157)!!! I switched them [main to 2nd and 2nd to main] to test. Wow this thing actually has power!!! So does anyone have a pair of jets around 140/220...
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