97 Brighton Bucking and hesitating

[gregginns]

Currently have a 5sp 1997 brighton with 138k on her. The plugs, head gasket and timing belt were all done
at 130k. Right now when I go WOT in 2nd gear the car will buck alittle like its not getting enough gas, also it
hits a little flat spot in the upper RPMs, not fuel cut but kinda like a bog. Also I replaced the fuel filter recently.
What should I change to fix this?

[Lanojoe]

Cleaning the injectors can make a difference ! But first check if around the fuel filter the lines don't take air somewhere.

[jey]

These come to mind:

Are you running 87 octane gas?
Have you checked your air filter?
You can try cleaning your MAF.
How old is your O2 sensor?

[Magoozle]

Also, check timing again. Even though your t belt was just done, doesnt mean it cant slip, especially if they didnt reinstall the little cover over the crank sprocket.

[gregginns]

Thanks for suggestions, the car threw a misfire code x5, so I replaced the plug wires and knock sensor.
She runs like a champ now.