Hi Guys my dad has a 2001 Hyundai Elantra. He replaced the whole exhaust system and gaskets and after he did that it wouldn’t start easy. He then relaplaced the fuel pump assembly and it still won’t stsrt easy. After it started it idled rough for a minute. Then if you shut it off and turn it back on it was fine unless you let it sit a few minutes. After turning it over many times it will finally start. Any suggestions?