About a month ago i bought a 91 toyota 4runner that had a blown head gasket i fixed that already but when i fisrt started it it felt like it was misfiring or possibly out of time (doubt it but its possible) has brand new spark plugs and the wires are good so im not sure what the problem is , and once its warmed up at operating temp it start to turn off you have to give it gas evry minute or so so it wont turn off ,was thinking possibly injectors thank you in advance