Hey, I'm new here...

[jimp2001]

I have an 89 V6 Camaro, painted kobalt kandy blue with house of kolor paint, weld aluminum rims (10" rear, 4.5" front), Nordskog digital dash, auto meter pillar pod with Air/Fuel and Fuel Press Gauges, a B&M mega-shifter, K&N filters, hallowed cat, and 2 1/2" dynomax cat-back exaust with 4" tips.

Here are some pictures:

My Camaro the day after the paint job (ftp://members.aol.com/jimp2001/images/camaro_0005.jpg)
Digital Dash and Gauge Pod (ftp://members.aol.com/jimp2001/images/jgfj_0001.jpg)
After a bath... (ftp://members.aol.com/jimp2001/images/newshit_0025.jpg)

...and yes, I do have a rear spoiler, I have a '92 Z-28 spoiler that I may/may not be putting on the car. If i dont put the '92 spoiler on the car, I'm going to put the stock back on the car

[jimp2001]

So heres my question....

I have been having engine problems with my camaro lately...

When my car is cold, is runs fine.
After driving for about 15 minutes, the car begins to buck, bog and stall.
It only does this below 3300 RPM, but throttle does not make a difference. If I slam the gas froma dead stop, the car will buck and bog until it hits 3300 RPM, and then it will run fine.
I spoke with a friend of mine who is a mechanic at a local chevy dealer, he told me it was most likely my fuel injectors.
Last weekend, I replaced my MAF sensor, fuel rail, fuel pressure regulator, and the 6 injectors.
I am still having the problem and I dont know what it is.

IF ANYONE HAS EXPERIENCED THESE PROBLEMS, please let me know what I can do to fix it... I am putting a 350 in the car soon, but I dont have the funds to complete my project, so until then I need the 6 cyl in running order.