hi i have a problem with mt car. when crusing at 100kmph then i try to go a little faster my car sometimes gets a flat spot. it just doesnt go. then it picks up all of a sudden. and it also stalls sometimes when chaging down gears. could it be a fuel issue or computer? i have an aftermarket computer system. i have checked all of the ignition system for misses. i did find a stuffed sparkplug (wasnt firing) and i also changed the fuel filter. could it be the fuel regulator?

try changing all your leads and your fuel filter as well if you havent done so change all the spark plugs not just one i doubt if it would be a software problem start with the simplest thing first and work your way up from there replace the air filter as well

i have changed the leads, th efuel filter. checked, cleaned and re gapped all the sparkplugs and its still there. hoping its not a blown gasket or anything now. gonna pressure test it tomorrow to rule that out hopefully.

Check your cam position sensor.

whats it like at idle? does it fluctuate coz mine didnt idle well/stalled when slowing down to lights. - i did base idle again and it was fine. if u have an aftermarket mite pay to get it tuned again maybe?

nah its fine at idle. i did fine a broken injector wire today tho. i fixed that and it got rid of the big miss. just got a tint 1 now. so itll be going back to my computer guy to see what he can find.