Maf change

[bubba]

Here's the skinny on everything. I bought a '93 mtx, and I found out that it had a 70mm t-bird maf on it. It ran like crap, so Jayro gave me his 75 to use, so I'd have the stock sho curve for it. It ran pretty good, until like Sunday night, it started running pig rich and wouldn't idle right. So I found a 55mm maf in the garage, put it in and reset everything, and went to leave, the car took off fine, and then started bucking and wouldn't hold a rev.

I found that the maf was off on one end. I up it back on, unplugged the computer to reset, and loosened to neg to reset the on the batt side of things. I was able to drive it home fine, however it likes to stall out, from time to time, I thing it's the iac or iab. Taking off It move's great through the rpm range, until 2nd gear, at about 3200 it feels like I hit a wall, and doesn't want to move from there, I hear the butterflies open up. It just feels slow after 4k and it feels like it run's out of air at 5500 rpm, it. No codes or cel either!

Any help would be greatful!

 

[jayro]

When you say no codes did u check them, or just have no cel? Did you try unplugging the Maf to see if it would run well without it? How do you know it was really rich? Did u clean the maf with maf cleaner and reset things afterwards? Are all your plugs firing? Water or oil in any of the plug wells? How are your O2's? If they are going bad it can cause a rich condition as well. Did you try putting the old Maf back on to see what happens?

 

[frosho]

I wonder if you might have a vac leak... Have you tried to look for one with starter fluid?

Cleaning the IAC and resetting the idle wouldn't hurt either.