01 Blazer with 135k miles. Blazer shows hesitation under acceleration at higher speeds (60ish), less noticeable drifting around town. Noticed small amount of coolant loss. Performed pressure test and saw water along intake manifold and valve cover. Will intake manifold leak cause hesitation? Recently installed new fuel pump. Checked fuel pressure shows 60 with key on. Drops to 54 at idle. Seems to be within spec of Haynes manual. No codes in computer. Also, just performed complete tune-up with plugs, cap, wires, rotor and ran great afterwards. MAF sensor replaced about a month ago - but computer showed code for that. I know replacing intake manifold is big job for backyard mechanic. Just trying to confirm this will take care of hesitation as well. Thanks in advance for your help.
Sunday, December 18th, 2011 AT 8:37 PM