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You said you have an exhaust fitted right?? Does it have a cat?? If its been removed the lack of back pressure will make it ping.
Is your TPS adjusted correctly?? I'm not sure about the TB42E but do they run a AFM? Is it working correctly ??
Theres 2 more things i can think of but they're a bit far fetched, are you mistaking a rocker assembly rattle for a ping?? Is TDC on the crank TDC on the cam ??
Just 1 more thing, if you really think its a lean ping, disconnect the vacuum from the fuel pressure regulator and plug it so the motor doesn't suck air then go for a drive. You could also crimp the return fuel line while the motor is running ( and fuel reg connected to vacuum ) and see if the idle rises ( that will just eliminate fuel flow and if its sucking air from anywhere)
I can get mufflers and cat for a good price you just need to get flanges, pipe and mandrels. You will save a few $$ doing it your self so what you would spend on a mild steel exhaust you can build a stainless one ??
Interesting! It is definitely food for thought. Id like access to a tig to weld stainless nicely.
Im away the next couple of weekends and will probably wait till i get the company car back if i do it myself. Can take my time and make it micky mouse!
Over engineered, tuned length, the collector i spent about 4 or 5 hours welding and grinding so the air hits a point and splits evenly lol 20 hours all up doing it in the name of FUN haha you just need to play with your wire speed and paint the weld so it doesn't rust