carbed ls with msd 6014

[danpatrick]

I have a 5.3 ls out of a 2002 Tahoe. It has the Truck Norris nsr cam and a Holley midrise dual plan intake with a Holley dp750cfm. I'm running a MSD 6014. I put in a new cam sensor in because the 6014 said it was faulty. The engine is running like it is out of time. It is popping in the carb and out of the exhaust, it also smokes a little bit and the spark plugs are black. the spark plugs are brand new. I would really appreciate any help

 

[Ricko1966]

I have a 5.3 ls out of a 2002 Tahoe. It has the Truck Norris nsr cam and a Holley midrise dual plan intake with a Holley dp750cfm. I'm running a MSD 6014. I put in a new cam sensor in because the 6014 said it was faulty. The engine is running like it is out of time. It is popping in the carb and out of the exhaust, it also smokes a little bit and the spark plugs are black. the spark plugs are brand new. I would really appreciate any help

Black plugs,
carbureated engine. I'd start with a compression test. Then basic fuel system trouble shooting. Float level,fuel pressure,choke operation,power valve,vacuum leaks.Many people dont realize a vacuum leak can cause a rich mixture. The carbureator adds fuel based in engine vacuum high vacuum readings are typically light or closed throttle and little fuel is added. Low vacuum is typically heavy throttle,lots of fuel enrichment going on. Now if you have a vacuum leak,the carbureator senses that as heavy throttle and adds fuel,but you don't have enough air because of the throttle plates are closed.If you can't find anything in the fuel system then move to ignition.