I have installed the Whipple supercharger system to my Mercruiser 350 MAG MPI but I need you guys help for trouble shooting.

Engine runs poorly and it seems to get too much fuel on idle. Engine runs unevenly because it wet some spark plug on idle and don't run on every cylinder.

We have check that distributor is correct and engine fires with every cylinder. Installation should be done correctly. We were very attentively with installing.

We tested to run engine injectors coupligs unplugged. Engine did idle perfectly with remaining fuel about 20-25 seconds.

Do you guys have ideas what we should check and how we get engine idle correctly with every cylinder? We haven't done lake test yet.

There is a special procedure for installing / locating the distributor in the 350 MPI engine, if the distributor was removed or turned with the clamp bolt loosened. Not sure it has anything to do with your problem, but just FYI.

350 MPI Horizon Base Timing

Is this a complete kit from Whipple ? including the correct injectors and ECM retune

Yes it is. Complete kit from Whipple and ECM retune by Whipple. Injectors are from Whipple kit.

Contact Whipple?

Welcome to the pig rich world of Whipple........lol...........I had to have mine retuned twice and there still a bit rich, you'd probably be best off sending the ecm to Whipple and have them work on the fuel tables.

Yes, I did send email to Whipple today. But I thought that you guys on this forum have also a lot of experience and knowledge.

Not sure if your set up has a IAC valve but one of my engines was doing the same thing. The IAC valve was malfunctioning and would not idle and sometimes stall. I switched valve with other engine and the problem followed how I found it. Now I have a extra one on boat, with a coil.

Is it possible to adjust Mercruiser original Weber fuel regulator?

How about you back up and tell us all the components you have installed, we dont even know the model blower