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C4 L98 bogs down and engine rattles as it warms up!
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BigNBeefy
I watched Corvette Summer
| Posts: 2
| Joined: 09/08
Posted: 09/22/08
06:52 PM
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Hi guys new here lookin forsome help i have a 85 tpi 350, iv changed everything , rotor,cap,wires,plugs fuel,air,oil,filters, thermostat 160deg. driving it it starts really good and as it warms up engine starts to rattle when u stomp on it and it gets worst. any ideas?
im hoping to find the solution soon 
BTW love the site lots of cool info and pics.
thnx in advance.
paul
BIGNBEEFY@cox.net
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55Guy
Administrator
| Posts: 210
| Joined: 07/06
Posted: 09/24/08
06:44 AM
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Bogging down, either the Mass Air Flow Sensor or Throttle Position Sensor have gone bad.
Are you getting a check engine light?
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BigNBeefy
I watched Corvette Summer
| Posts: 2
| Joined: 09/08
Posted: 09/27/08
08:29 AM
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 no engine light thnx for ur answer , i found that the catalitic converter was clogged, pulled it out guted it and put it back toghether and man what a difference.
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lonewolf11
I watched Corvette Summer
| Posts: 10
| Joined: 04/09
Posted: 08/31/09
08:50 AM
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I too had a similar problem. What gave me a clue was how the exhaust sounded while driving. Clogged Cat due to internal breakup. Gutted it and replaced the main Cat. Since then I replaced the front Y-pipe with non-pre cat Y-pipe and a straight thru center pipe and new rear Y-pipe. On the center pipe to allow the air tube to function some modification was done. I purchased a new MagnaFlow Cat for when smog needs to be done (california). Check the other mods I have done to my 87 Corvette on these pages.
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