alright guys my 87 formula with the lg4 is running like crap it is running rich surging at idel in park or gear and somtimes it dielsels when shutting down and cranks over real hard when starting the timing is right new plugs and wires what next

 

scan for codes, make sure the tune up is good, filters all good, tps, iac adjusted right

 

it has all new plugs wires cap and rotor and do i have tps and iac