1991 volvo 240 b230f+t chipped 465cc 3'' afm issue

hello! i'm having a problem with my recently chipped green 465cc injector b230f+t lh2.4.. i've heard i need to rebuild the ignition resistor but the 91 240 lh2.4 is different then the 940 ignition resistor. i cant seem to figure out where and how to do it. also it ran very smooth after chipping it but it would cut out and stutter when i got close to wide open throttle. i let it sit for a weekend in my shop and this morning i got a no start. i can't put my finger on it.. it ran fine days ago...... thanks any help is much needed.

some reference photos

https://imgur.com/a/CRpGopT

Do you have a wideband? If so what does it say the afrs are when running?

If you have a no start check the basics, is there spark? Check the rpm sensor and power stage.

i don't have a wideband ive had a few people recommend i get one so ill pick one up. do you know of a certain one i should get? also no start was basic! i took the spark plugs out to gap them and forgot to plug the wires in so i think i soaked them. tried again a few hrs later and it started right up! last question do you know if i need a resistor for the 91 lh2.4?