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have you changed the coolant temp switch not the one for the gauge{1wire} but the other one that is {2 wire i believe}
another possibility could be a vaccum leak check the intake connections
one thing that you can check is the VICS solenoid i broke mine working on the car and didn't know it. the car ran like crap kinda the same symptoms you are having. i advanced my timing and it helped but there was still a problem i JB welded it to get me buy till i got a new one thanks to LOWETGT check if the vaccum lines are connected to it and not broken. if that is the problem then retime your car to the stock timing marks and adv. or ret. as needed
here is a picture of the solenoid that i reapaired
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another possibility could be a vaccum leak check the intake connections
one thing that you can check is the VICS solenoid i broke mine working on the car and didn't know it. the car ran like crap kinda the same symptoms you are having. i advanced my timing and it helped but there was still a problem i JB welded it to get me buy till i got a new one thanks to LOWETGT check if the vaccum lines are connected to it and not broken. if that is the problem then retime your car to the stock timing marks and adv. or ret. as needed
here is a picture of the solenoid that i reapaired
