I read in another post that you have the ZZ4 cam and stock prom. Any issues or problems with your combo?
Thanks

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87 Formula 350 14.61@94.07 before 2OTL, TCI stall, Nitto's, tubular LCA's & panhard
98 Z28 1LE 13.15@107.59
1LE Owners Association

 

I have a custom prom now, but I used the stock prom for a long time and when I went in for the smog test. Overall driveability with the custom prom is much better, but I never had any problems either with the stock one...no stalling, no erratic idle, no codes, etc. It idled a little rough in the mornings but it was pretty smooth after it warmed up. I also raised the minimum air setting slightly higher because of the cam when I used the stock prom...it idled around 750 in drive. BTW, the times in the sig are with the custom prom.

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1989 IROC-Z, ZZ3 shortblock with some bolt-ons.
13.20 @ 108.69, 2.2 60'

 

I used the ZZ4 cam and stock 305 5-speed PROM in my car too. It idled great and got good gas mileage. Then I used a custom PROM that changed the WOT values for more timing and fuel, but the idle stuff was untouched. This cam is great.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
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