limited rpm at full throttle

[19ed50]

just changed distributor caps and rotors on twin 350's- ran smooth up to 1200 rpm-during trial run- when forging ahead port engine limited itself at 2100 rpm- starboard went to 3000- I immediately reduced back to 2100 to match- mechanic questioned fuel pump- which momentarily operates when key is just turned on- there seems to be several electronic controls involved starting with the ECM- mechanic suggested computer analysis and/or pressure test on fuel pump- was there something set ajar by changing the distributor- seems to be process of elimination- I would like to know the recommended logical progression of tests to approach this - thank you to all for any suggested approach- 19ed50

 

[Thornton69]

New problem? Only the the caps and rotors were changed? New plugs with gaps checked? Was the 1200 rpm during a timing check?

 

[Espos4]

Did you have the same issue (limited rpm’s) BEFORE the caps and rotors were replaced??

 

[Fill Ess]

All plug wires in the correct spot? I'd verify with the other engine to be sure