Hesitates/Bucks when cold

gorynytch

Registered User
My '89 SC hesitates when the boost kicks in, but she only does it when she's cold. The warmer she gets the more boost i can use. Pre-boost she drives fine, no hesitation at all, cold or hot. Once everything is warmed-up i can floor it without a skip. I've replaced the coilpack, DIS, crank sensor, cam sensor, and cleaned the battery connections, the only thing that worked and it was only temporary was replacing the plugs and wires she ran GREAT for about a month and now it's back to the same old thing.

Any suggestions ?

Thanx Mark.
 
my fuel pressure reguator sticks sometimes when its cold , i think i used stp gas treatment helped it a lot, maybe a plug fouled or a wire came loose, i know on my higher mileage car with colder plugs i have to change them about every 6 months
 
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