I start my car n it idles ok till it warms up than its really ****ty idle - ok so i let it warm up and i adjust the idle screw, it idles great, i tighten that up and drive it, it's fine - as soon as i turn it off, n start it back up, the idle resets itself to ****ty - its weird - so i adjusted the TPS instead this time, just not according to my volt meter, just adjusted it so the idle would be nice, n it still sucks when i shut it off and turn it back on - someone said my timing is jumping around - what does that mean, n shoul di jus junkt his car?