Just to share my results, My Z was having a bad case of engine idle and some ping on low RPM's. I found a good deal on a M370 Manifold and decided to install it this last weekend. I bought MAF Cleaner for the intake sensors and when i swapped the M370 i cleaned the throttle bodies.. Man what a diference, my car is idling perfect. It feels more responsive.. can't wait to get a tune. Bottom line is that i reccomend everyone with 25k+ miles to clean the throttle bodies! I did the calibration process just in case.
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