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Cobra Forums
The Terminator
Engine/Tuning
Stumble when accelerating
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<blockquote data-quote="olympic" data-source="post: 16498278" data-attributes="member: 168598"><p>If your manifold vacuum is too low the bypass valve will remain closed causing drivability problems and high IAT's. Or sometimes you have just enough vacuum to open the valve but as soon as you touch the throttle the valve closes or flutters open/closed. I had my car tuned by 2 tuners with the stage 4 cams and it never drove well. It always wanted to stumble or buck when taking off and also stumbled when transitioning from vacuum to boost. I couldn't drive in city traffic for very long before IAT2's would reach 80C/180F due to reversion. I think a good local tuner could have resolved the driving issues but I don't have access to one so I swapped to some milder cams.</p></blockquote><p></p>
[QUOTE="olympic, post: 16498278, member: 168598"] If your manifold vacuum is too low the bypass valve will remain closed causing drivability problems and high IAT's. Or sometimes you have just enough vacuum to open the valve but as soon as you touch the throttle the valve closes or flutters open/closed. I had my car tuned by 2 tuners with the stage 4 cams and it never drove well. It always wanted to stumble or buck when taking off and also stumbled when transitioning from vacuum to boost. I couldn't drive in city traffic for very long before IAT2's would reach 80C/180F due to reversion. I think a good local tuner could have resolved the driving issues but I don't have access to one so I swapped to some milder cams. [/QUOTE]
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Stumble when accelerating
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