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I recently changed the plugs in my 93.5 Supra TT and while I had them out, I checked the compression. All the cylinders read in the 185-195 psi range except for number 3 which read 160. I did have the fuel injection fuses pulled, all the plugs out when I ran the test, and the throttle body held wide open. What would cause such a variance and should I be concerned? I am planning on putting a T78 on in the near future. Will this be a problem?

Rob
 
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