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[AndyF]

If the Sniper is too rich then change the Target AFR table. That's what controls the AFR. You also might need to change the various enrichment tables...

[AndyF]

The wiring harness isn't the same, so you'll need to rewire things. There was one post on here recently about a guy who did the same thing, and he was...

[AndyF]

It's also possible your tune is just so lean, that it can't support the engine requirements. A quick check would be to change your Closed Loop & Learned...

[AndyF]

It's also possible that one of the injectors isn't firing. Double check that all injectors are working.

[AndyF]

Fuel delivery problem. Low fuel pressure, clogged filter, weak pump, out of gas, etc.

[AndyF]

Rough at idle, could be a vacuum leak. Not uncommon for the intake gasket to fail on those engines.

[AndyF]

I'd set AFR in the upper right corner of the map at 12.8 and then check the plugs after a few pulls just to be sure. I'd also switch to a HyperSpark distributor,...

[AndyF]

Sniper engines are sensitive to oscillations since the control circuit is crude and because it's user adjustable. There are rules to follow to reduce...

[AndyF]

Are you driving or is this sitting in the driveway? What kind of PCV setup do you have? If you have a conventional PCV valve, remove it and see what ...

[AndyF]

Yes, it'll work as long as the manifold works. The fuel map will just have to be calibrated for the small engine and low power output.

[AndyF]

Either one should work, I like the bottom picture better. It looks a little cleaner.

[AndyF]

Lots of things can cause that so you'll have to do some debugging. A datalog would help if you can catch it in the act. If not, start with the usual suspects....

[AndyF]

Well I don't think we're guessing since I've built and tested dozens of EFI fuel systems and have never had a problem with fuel pressure pulsing. The...

[AndyF]

There isn't a "plug & play" fixed orifice PCV available for Mopar engines with stock valve covers so you either need to modify an existing...

[AndyF]

I don't think you need to flow the fuel in & out of each throttle body like A has it. B would the easy one to test since you only need two fittings...

[AndyF]

Looks like an easy test. All you need to do is to hook up the pressure line to the front throttle body using a T-fitting. You can leave the rest of the...

[AndyF]

You might want to raise the idle speed until you can find more manifold vacuum. You probably need more timing at idle, as well as less fuel. For now you...

[AndyF]

@mouserider: Depends which Sniper throttle bodies you have. Post a picture so everyone is on the same page. You don't need return lines from each throttle...

[AndyF]

The drawings you post show plumbing schemes that might work, but putting the regulator in the return line (after the throttle bodies) seems to work better....

[AndyF]

Only time I've seen that kind of pulsing is when the plumbing is wrong. Try putting the regulator in the return line, rather than on the pressure sid...