mazd speed fuel issue

Hello all, I’m running into a huge problem on my speed 3. I’m having a cylinder 1 and 4 constant misfire. It will randomly stop and run fine then go back to misfiring. Recently it has not stopped misfiring. What I have done: Spark plugs replaced and gapped MAF replaced Set of fresh injectors...

Year/Make/Model:2006 speed6 Mileage: 160k Location: Missouri Concern: warm idle is sporadic and in boost sometimes has hiccups DTC's: lean at idle, rich at idle Modifications built bottom and bolt ons Cs fuel pump internal ECU/Tuning Software: versa Tuner: freak Is the concern intermittent...

2008 mazda speed3 99k miles. I bought the car a few months ago. It ran great put 3k miles on it. Bought ap for it and a few weeks later it started to stumble. Just once at first then over the next week it would stumble then throw a cel for fuel rail pressure sensor low voltage. I would clear the...