Vehicle is a 2017 Dodge Grand Caravan 3.6 pentastar motor. Bought new in 2017 and use only for Uber. It has 267k miles on it now. This is a messy situation so I need someone who can pay attention to all details here and timeline of details. Others have looked at this including 2 dodge dealerships and another nationwide company and the problem still exists. 

11/2020 spark plugs changed at approx 170k miles for the first time

2/2021 p0303 code and cylinder 3 coil changed at a local shop at approx 183k miles

3/2021 p0420 code and catalytic converter changed at a local shop at approx 187k miles

3/2021 p0152 code and oxygen sensor changed at local shop at approx 189k miles

11/2021 p0420 code returns and catalytic converter is replaced under warranty but they also say my plugs are worn and a bad coil fused to cylinder 3 should be replaced to avoid another converter issue down the road so I had them replace the plugs and cylinder 3 coil at approx 240k miles

12/2021 p0305 code now so now a cylinder 5 coil is bad and gets replaced at approx 245k miles

12/2021 a week later p0305 code returns again and local shop checks everything and says everything is fine and condemns the motor internally. They said they swapped the cylinder 5 coil and plug and injector to other cylinders and the problem stayed on cylinder 5. They also say they did a compression test which failed on cylinder 5. I took it to a local dealer for a second opinion and the dealer said they did the same process and condemned the motor also. Approx 245k miles

3/2022 local shop received a reman motor and also a transmission from Jasper Engines and Transmissions that I opted to put in to save on downtime and not buying another vehicle. From this point forward it was nothing but problems with sloppy installation issues with leaks for the next several weeks. Also I have a scanner and was able to detect low count random misfires daily on this new equipment. Check engine light comes on June 2022 and the same cylinder 5 code p0305 again on the new equipment that came on 6 months earlier when the old engine was condemned.

6/2022 p0305 returns and I file a claim with corporate for the local shop for misdiagnosis of my van. The van is diagnosed at a second dealership where they say this was clearly a computer issue that was bad and a wiring issue for the cylinder 5 coil to the computer. They ordered a computer and it would take a few weeks 

7/2022 new computer received at the dealer and put in with the wiring fixed also and things looked good for a couple months til it happens again!

9/2022 p0305 returns but no check engine light just a stumble while driving and coming to a stop or idle with low count misfires just not enough to throw a check engine light. Now I’ve opted to have all new dealer plugs and coils and injectors replaced!

10/2022 having other low count misfires upon stumble at idle or coming to a stop on cylinders 1,3,4,5. This stumble only happens at idle or coming to a stop and every scan I do it’s only on any one of those cylinders at a time never more than one cylinder on occurrence. Usually just one stumble a day on one cylinder but can be random and change the next day. Also after all this I just had a p0430 for the bank 2 converter and smell with that converter so it had to be replaced and I had all 4 oxygen sensors done too. This is all mopar dealer parts and labor at this point. The only parts not dealer are the engine and transmission. Everything else I have had replaced has been done at the dealer. Now I’m getting another p0420 code for the bank 1 converter that was replaced twice already back in March and November of 2021. This is absolutely ridiculous! I’m really hoping someone can point me in the right direction here since I’m lost on this and apparently I think strongly the nationwide local shop and both dealerships are also! Please don’t hesitate to ask any questions and thank you for any help!