I was wondering what the best(if any) plug and play fuel injectors are for the 4.0 on my 1988 xj? I have read some discussions on here about injectors and there is a lot of technical talk and numbers flying around and modifications, etc. I just want the most dummied down suggestions please. And also with how expensive they are I was wondering if it is ok to just replace one at a time like with every pay check or if they should all be replaced at once? Thanks for any help.

A little rambling, but you will find all the "testimonials" are good> https://www.cherokeeforum.com/f2/199...r-swap-163105/

For the older Renix 4.0's the 746 Volvo injectors are the best match. I got the set of 6 off eBay real cheap but you could do you own JY search or there are a couple guys on this forum who like to sell injectors. The thread that DFlintstone gave has all the info.
Best of luck.