Don't know if you have them on that car, gut I had same symptoms that were solve by fixing the cold start fuel injector.
Also put the car model & problem into google &/or youtube search, your bound to come up with some good info.
Your not the first one with this problem on that model or close to it.
Many are becoming into keeping the old rigs running ("gee, I wonder why?") and putting useful info on the "interweb" to help others.
Good tip.
Need to do good troubleshooting or you’ll spend a lot of money. But on the upside, if the shotgun approach works you’ll have a lot of new parts! ;^) Jk
Have you tried checking for fault codes in the computer as well? Get the code and search the web for it, it’ll give you an idea as to what the problem is and help you narrow it down.