87 fiero gt sluggish acceleration

[joeas]

alright I just bought a 1987 Pontiac fiero gt 2.8l v6 automatic about 2 weeks ago. revs up fine in park but once in gear the car accelerates very slow even if I floor it. the ses light was on had code 33 & 44. I replaced my map sensor and fixed an exhaust leak. ses light hasn't been on since but I still have sluggish acceleration. I've also changed my air & fuel filter and my coil. I don't believe its the transmission, the car shifts smoothly. I'm completely lost because the engine runs so smooth and sounds strong.
does anyone have any ideas on what it could be?

 

[melsg5]

Try a fuel pressure test and does the transmission downshift when you floor it? Have you changed the transmission fluid and filter assuming you dont know when it was last serviced?

 

[Sal Collaziano]

Yeah, it kinda sounds like an issue with your kickdown cable. Amongst other possibilities, anyway...

 

[phonedawgz]

+1 on checking your fuel pressure

Check your timing. Use the correct procedure when setting the timing. You have to jumper A - B on the ALDL connector.

Does the exhaust note sound odd or wheezy? A blocked CAT or muffler can cause power loss at load A quick test is to remove the O2 sensor from the exhaust down pipe and see if that increases performance greatly.