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can't go faster then 25


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went out to gorman and had some problems after driving around for 30 mins, truck idles fine but once in gear and accelerating it can't get good power. Ive replaced the air and fuel filters and vacuum harnesses, CPS, blown out my MAP, i assume since it idles fine and can hit high RPMs in neutral that the IAC is functioning properly. the truck drives fine for about 15 seconds or quarter mile then feels like something is clogged and will not exceed 25 and struggles to get there, any ideas

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9 minutes ago, 87MJTIM said:

Clogged cat?

 

I had a similar issue when trying to accelerate.  Loose pieces inside the cat would shift restricting exhaust flow.

seems to look pretty new but definitely could be an issue, gonna drive it straight piped and see how it feels

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