Motor has a miss, need help please

z_stalion84

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Motor mods - cold air intake, 70mm tb, typhoon intake, motha thumper cam (dont know specific size), ported polished stock heads, 1.6 roller rockers, hardened push rods, shorty headers, msd ignition, chip w/3 different tunes (street, performance, race), e3 plugs, walbro 255 fuel pump (i believe)

My problem is while driving round under 10% throttle the car kinda sputters and misses, in any gear. If I give the car anything above 10-15% throttle it runs great. I dont know much about trouble shooting this stuff.

Any help would be awesome
 

Steven

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Those mother thumper cams aren't known for driveability and manners. All they do is make noise, and in some rare cases they make power. Is it anywhere particular in the power band this is occuring?
 

ivan12

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Was the chip burnt for that cam?
 
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z_stalion84

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The chip was tunned for all the mods

The sputtering usually happens between 1k and 3k rpm. But as the car has been running for a period of time it dosnt do it as bad. Its really bad when the motor is cold
 

Steven

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Check the distributor out. Does the shaft wobble alot? Could be a slowly dying distributor, which i've had happen before
 

toyman

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My guess is the tuner didn't pay much attention to the cold start fuel parameters.
 

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