Hi all,
I bought 1996 chevy blazer few weeks ago its have efi conversion and LS ecu, i have some troubles with the car, firstly we had some ignition problem some of the wires has been misfiring from head the lights coming out can be clearly seeing So we replaced wires and few minutes car runs perfectly and then car is surging when drive i check the afr gauge its showing 15 16 but there is no misfiring right now also when I connecting with obd its showing me p0452 codes, some one have any ideas about these problems?

 

P0452 is an evap system malfunction which should not effect how the truck drives so we can address that last. Regarding the truck running poorly:

1. What are your 4 fuel trim values first in park at idle and then in park at 2500 rpm?
2. Mist the engine with water around the ignition parts in the dark and see if you have any arcing
3. Make sure that there are no exhaust leaks or restrictions
4. Do you have any reason to suspect the catalytic converter being exhausted or plugged
5. Cab you graph the O2 sensors?

George