HELP, have tried and replaced everything, I think. 94 chevy camaro z28 5.7. After driving about 30-40 miles, hesitation when accelerating until hard accelerate and rpm goes crazy. Then when cooled down doesn't do it again until engine warms up. Also took to smog and didn't pass. Changed egr and solenoid took in and soon as i got there, started acting up again. Also any way to change spark plugs on right side easier than tearing car apart. HA HA

 

There is no easy way to change plugs in this car. Dropping the exhaust head pipes helps, use plenty of liqid wrench to avoid broken studs. Wheb you change the plugs change the wires also. If the car is stock, use the factory plugs, they are expensive but last a long time and you don't want to change them more than once. If you do the wires, which is a lot easier with the engine half dismantled, make sure you put all the aluminum heath shields back on the spark plug connectors. This will probably clear your trouble. If not the it is probably the optispark, especially if it got wet.