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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 15976
Experience:  Have owned a repair shop for 25 yrs.
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Chevrolet Tahoe 4x4: TimHave a 98 Tahoe 2 door 5.7

Customer Question

Hi Tim
Have a 98 Tahoe 2 door 5.7 Collapsed lifter and once head removed found cracked head.
Replaced will all new lifters, new head on one side. new alum base distributer, wires and plugs and fuel injection system.
Engine missing on 5 & 7 at idle ... very rough idle, smooths out some above 2000 rpm but not right. Checked wiring loom and signals from ECU to injectors .. ok
Unplug MAF when idling and no change.
Going to replace MAP sensor and ICV this weekend. Do you have any other suggestions ?
Submitted: 2 years ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 2 years ago.
Hi,My name is Tim,
I will do my best to assist you
it sounds as if you may have a bad vacuum leak..check all hoses/lines,but,the problem may be a sticking egr valve,,remove the egr valve and clean it,make sure it closes all the way,it may have carbon under the valve causing it not to close all the way,thus,causing a major vacuumleak from the exhaust
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