Surging??....
 

Cruised the town tonight for a good hour and a half. Got on it a couple of times. Lots of stop and go with the lights, etc. Started to head home and there is a bridge I drive under that I like to get on the car a little and hear my exhaust roaring. Anyhow, I'm in third and get on it, but the car starts surging and doesnt rev up like usual when I get on it. It wasnt surging hard, kind of like a miss, but it was like there was no power. I pull up to a red light(it idled normal), light turns green, I take off normally in first, shift to second and give it some gas and it surges the same. I've had this car a month and I dont need anything wrong with it yet :) Into third, still surges. I drop my brother off, and am kind of driving it fast through town. I've got one more street before I turn to my apartment. I get on it through second and third and it seems to run fine. Was cruising through town bogging it down? It's got a bigger cam in it, with higher compression pistons. I'm a novice with a semi-built car....:) Any ideas? Temp gauge was normal. I'll start it tomorrow and see if anything changes.

What mods do you have?

Cut and paste is nice:)

289 small chamber heads-ported (2.02, 1.60)
Cobra 1.6 roller rockers
Manly pushrods
K-motion valve springs
Keith Black 10.5:1 pistons
Eagle rods
Stock crank-balanced
Ultradyne 588 lift cam
Cobra upper and lower intake
Edlebrock 70mm throttle body
24lb motorsport injectors
Underdrive pulleys
JBA longtube step headers
MSD ignition box and coil
Motorsport high volume fuel pump
Electric fan
Two chamber flowmaster exhaust
World Class 5 speed- Pro 5.0 shifter
Motorsport billet flywheel
Centerforce clutch
Adjustable clutch linkage and Steeda clutch quadrant
Motorsport aluminum driveshaft
Lakewood driveshaft loop
8.8 with Richmond 4:10
Auburn 31 spline Posi unit
Moser 31 spline hardened axles
95 cobra disc brakes and rims
6 point roll bar
Monster Tach

Would an exhaust leak cause any sort of problem like that?

Maybe a clogged fuel filter or your fuel pump is getting weak.

A fuel pump going sour can be the cause of this. Also a clogged fuel filter. Tell us more about the pump and filter. I have heard of clogged injectors causing this. Any way it sounds like fuel to me.

I ran it today and it pulled strong like it usually does. I've been emailing with the guy I bought it from. I asked him if he had ever changed the fuel filter and I am waiting for a reply. He had mentioned checking all vacuum hoses and sensor connections. Everything looked good except for the positive and negative wire to the Blaster coil were loose enough I could undo the nuts with my finger. I tightened those done, took it for a spin and everything runs normal. I'll wait to see what he says about the fuel pump and filter. Thanks for your input!!

I had the same thing happen to my car right after i bought it. I was driving up the road and the car started surging a little, but it didn' stop there. It ran fine for another five minutes, then i went to hit the gas and nothing happened, when i pushed in the clutch the rpm's dropped to zero and the car wouldn't start. I let it sit, banged on the gas tank and it worked fine again, for a while. I ended up replacing the fuel pump and it hasn't givin me a problem since.