Qjet stumble 360 Amc
I recently installed a brand new Jet Performance Qjet on a perfectly working 360cui Amc. The car is a Jeep Grand Wagoneer.
The car idles great and the low end throttle responce is very good. It even feels fine under light acceleration. But as when you hit the gas the engine stumbles until you back off the throttle. It does not matter if you drive in D or lock it in a lower range.
I already tried tightening the secondary spring with no success.
I checked the timing and set it to 34 degrees at 3500 rpm.
The fuel pump is new so is the filter.
What could cause the stumbling?