looking for someone who has cured their problem with a cold hesitation"feels like stuck in the mud" in first gear under light throttle at around the 1800rpm-2000rpm mark then kicks in and seems to clear up. seems to clear up once engine temp comes up, i've heard so many things to check i don't know what to do and would rather not replace parts i don't need, i did a tuneup, cleaned mass air, idle control valve and throttle body, seems like either engine is going lean or the timing is jumping around, these parts aren't cheap so if i can't figure something out soon i'm gonna have to take it somewhere that can run a diagnostic, please help, leaning towards a 02 sensor or faulty knock sensor but don't want to make a hundred dollar mistake, thanks in advance