my 92 camaro 305 tbi ran great, i just had hi nox on my emmissions test. egr, tps, iac, map, fuel pump, all were replaced before the test. after reading all i could find the only thing that kept coming up was that i may have had carbon buildup in the combustion chamber, which caused a slight ping using regular gas, but not with premium.

so i used seafoam thru the pvc hose to clean the intake & combustion chamber, i the started it up & extreme white smoke for 15 minutes, i then drove around for another 15 minutes & it ran the same as always with no other issue, then i stopped at the store, started it up after 20 minutes & immediately the car died. it had never ever done that before i put the seafoam in. started it back up & it died four more times, & eventually, after revving the engine several times it ran ok. Now it takes more than about 5 or 6 seconds before the car will start from cold, warm it starts rite up. i have since replaced the plugs but it does the same thing. it also now stalls & surges sometime when im driving.


it used to take just 2 seconds or so to start. also i took off the egr & the intake passage is now stopped up & it wasnt before, & it must be clogged at the head intake because i cleaned out all i could get thru the egr intake hole & it is still clogged, & i believe i was all the way down to the head.

do u guys believe my intake is clogged/

would this cause my problem?

the car ran great before the seafoam treatment.

do i need another can of seafoam?