Can bad exhaust cause engine to cut out?
 

I have a 97 Jeep Cherokee. I had an exhaust leak and had it welded a couple weeks ago. When getting it fixed the guy said the cat had a little rattle to it. Just a couple days ago the exhaust started leaking bad. It looks like the bottom of the exhaust blew out.
Since around the time the exhaust started leaking the first time (maybe a little before) the engine has cut out some, more whenever the engine is cold. Could this be cause from a possible clogged cat and exhaust?

I have done a lot of work to this jeep since i bought it. Has new TPS,MAP, CPS, plugs wires and cap, new front 02 sensor.

Yes, a clogged cat can cause this kinda of stuff

Did any of these actually test defective or were they just replaced? You can test for an exhaust restriction using a vacuum gauge.

Yes they were all defective/ general maintenance. The jeep only has 88000 miles, i believe it was sitting for awhile before i got it so have had lots of issues.

http://www.autopartswarehouse.com/sk...gs+Best+Seller

I am considering getting this catalytic converter for my jeep. Has anyone heard much about these?

I plan on getting a dynomax cat back exhaust with it.

So found out some more about my issue. I decided to check the fuel pressure on the rail again and when the engine cuts out the pressure drops from 46 to between 40-42. I have read it could be the relay but i am not sure? Any ideas?