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

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

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.

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...

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.

Here are some picts to add for this thread.

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...