V6 1990 engine idles fine up to 2800 rpm,surges after that. on 1990 Toyota 4Runner

Replaced fuel pump,filter,and mass airflow sensor,scratching my head need answers soon.

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 4 comments
IS THE CK ENG LIGHT ON?
no light.This happened all of the sudden after filling up with good high test gas.truck ran fine before that.sorry to sound short but this prob is keeping me from a new job out of town.I'm a motorcycle tech that's why this bothers me,when I don't understand something.This is my first toyo,I'm a chevy guy. Help is much appreciated.
DID YOU HAPPEN TO GET A LOAD OF GAS WITH WATER IN IT?
Drained all new gas tried quarter tank after new parts.Please help
have someone with a scanner read the live data stream and see whats breakind down,