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I did a smog on my 92 b250 it has 087659 miles and I passed on everything but on the N/O part 319ppm over the max is 707 it measured at 1026 and that's without a tune up or oil change or new filter so I came home and put new distributor cap and rotor New spark plugs and did a oil change will this help?and the oil was dirty to wear it smelled like gas a little and all spark plugs was gapped differently