Trying replacing your valve cover gasket and seals $29.00. Canadian Tire. Takes about 2 hours if you've never done this, but there is a tutorial on www.youtube.com
search Toyota Celica valve cover replacement.
Hesitation with acceleration
Oil consumption issue
Stuttering idle - didn't hold idling power in my driveway
P.S. The major problem I had was oil getting on my coils and spark plugs. My seals and gasket were lifting inside my valve cover inside the engine. Toyota quoted me $2,500.00 to do the replacement. We all know dealerships are criminals.
I fixed resolved my issue for under 30 dollars.
Hope this helps I had the exact same problems and some